358409
Which of the following is constructed on the principle of electromagnetic induction?
1 Voltmeter
2 Galvanometer
3 Generator
4 Electric motor
Explanation:
In a generator e.m.f. is induced according as Lenz's Law rule.
PHXII06:ELECTROMAGNETIC INDUCTION
358410
A six pole generator with fixed field excitation developes an \(emf\) of \(100\;V\) when operating at \(1500\,rpm\). At what speed must it rotate to develop \(120\;V\)?
1 \(1200\,rpm\)
2 \(1800\,rpm\)
3 \(1500\,rpm\)
4 \(400\,rpm\)
Explanation:
The \(emf\) induced is directly proportional to rate at whcih flux is intercepted which varies directly as the speed of rotation of the generator. New speed \( = \frac{{120}}{{100}} \times 1500 = 1800\,rpm\)
AIIMS - 2007
PHXII06:ELECTROMAGNETIC INDUCTION
358411
A generator has an \(e.m.f.\) of \(440\,volt\) and internal resistance of \(4000\,hm\). Its terminals are connected to a load of \(4000\,ohm\). The voltage across the load is
1 \(220\,volt\)
2 \(440\,volt\)
3 \(200\,volt\)
4 \(400\,volt\)
Explanation:
Total resistance of the circuit \( = 4000 + 400 = 4400\;W\) Current flowing \(i = \frac{V}{R} = \frac{{440}}{{4400}} = 0.1\,amp\). Voltage across load \( = Ri = 4000 \times 0.1 = 400\,volt.\)
PHXII06:ELECTROMAGNETIC INDUCTION
358412
Assertion : A dynamo converts mechanical energy into electrical energy. Reason : The dynamo is based on the principle of electromagnetic induction.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
Dynamo (as in old bicycle wheels) is a device designed to convert mechanical energy into electrical energy. When a conductor, typically a coil of wire, rotates within a magnetic field, it experiences a change in magnetic flux, inducing an electromotive force (emf) according to Faraday's law, Both Assertion and Reason are true and Reason is the correct explanation of Assertion. So correct option is (1).
PHXII06:ELECTROMAGNETIC INDUCTION
358413
A coil having number of turns \(N\) and cross-sectional area \(A\) is rotated in a uniform magnetic field \(B\) with an angular velocity \(\omega\). The maximum value of the emf induced in it is -
1 \(\frac{{NBA}}{\omega }\)
2 \(NBA\,\omega \)
3 \(\frac{{NBA}}{{{\omega ^2}}}\)
4 \(NBA\,{\omega ^2}\)
Explanation:
The flux linking with the coil at any instant \(t\) is given as \(\Phi = NBA\cos \omega t\) \(\therefore \varepsilon = - \frac{{d\Phi }}{{dt}} = NBA\sin \omega t\) Therefore, the maximum value of \(emf\) is \({\varepsilon _{\max }} = NBA\,\omega \)
358409
Which of the following is constructed on the principle of electromagnetic induction?
1 Voltmeter
2 Galvanometer
3 Generator
4 Electric motor
Explanation:
In a generator e.m.f. is induced according as Lenz's Law rule.
PHXII06:ELECTROMAGNETIC INDUCTION
358410
A six pole generator with fixed field excitation developes an \(emf\) of \(100\;V\) when operating at \(1500\,rpm\). At what speed must it rotate to develop \(120\;V\)?
1 \(1200\,rpm\)
2 \(1800\,rpm\)
3 \(1500\,rpm\)
4 \(400\,rpm\)
Explanation:
The \(emf\) induced is directly proportional to rate at whcih flux is intercepted which varies directly as the speed of rotation of the generator. New speed \( = \frac{{120}}{{100}} \times 1500 = 1800\,rpm\)
AIIMS - 2007
PHXII06:ELECTROMAGNETIC INDUCTION
358411
A generator has an \(e.m.f.\) of \(440\,volt\) and internal resistance of \(4000\,hm\). Its terminals are connected to a load of \(4000\,ohm\). The voltage across the load is
1 \(220\,volt\)
2 \(440\,volt\)
3 \(200\,volt\)
4 \(400\,volt\)
Explanation:
Total resistance of the circuit \( = 4000 + 400 = 4400\;W\) Current flowing \(i = \frac{V}{R} = \frac{{440}}{{4400}} = 0.1\,amp\). Voltage across load \( = Ri = 4000 \times 0.1 = 400\,volt.\)
PHXII06:ELECTROMAGNETIC INDUCTION
358412
Assertion : A dynamo converts mechanical energy into electrical energy. Reason : The dynamo is based on the principle of electromagnetic induction.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
Dynamo (as in old bicycle wheels) is a device designed to convert mechanical energy into electrical energy. When a conductor, typically a coil of wire, rotates within a magnetic field, it experiences a change in magnetic flux, inducing an electromotive force (emf) according to Faraday's law, Both Assertion and Reason are true and Reason is the correct explanation of Assertion. So correct option is (1).
PHXII06:ELECTROMAGNETIC INDUCTION
358413
A coil having number of turns \(N\) and cross-sectional area \(A\) is rotated in a uniform magnetic field \(B\) with an angular velocity \(\omega\). The maximum value of the emf induced in it is -
1 \(\frac{{NBA}}{\omega }\)
2 \(NBA\,\omega \)
3 \(\frac{{NBA}}{{{\omega ^2}}}\)
4 \(NBA\,{\omega ^2}\)
Explanation:
The flux linking with the coil at any instant \(t\) is given as \(\Phi = NBA\cos \omega t\) \(\therefore \varepsilon = - \frac{{d\Phi }}{{dt}} = NBA\sin \omega t\) Therefore, the maximum value of \(emf\) is \({\varepsilon _{\max }} = NBA\,\omega \)
358409
Which of the following is constructed on the principle of electromagnetic induction?
1 Voltmeter
2 Galvanometer
3 Generator
4 Electric motor
Explanation:
In a generator e.m.f. is induced according as Lenz's Law rule.
PHXII06:ELECTROMAGNETIC INDUCTION
358410
A six pole generator with fixed field excitation developes an \(emf\) of \(100\;V\) when operating at \(1500\,rpm\). At what speed must it rotate to develop \(120\;V\)?
1 \(1200\,rpm\)
2 \(1800\,rpm\)
3 \(1500\,rpm\)
4 \(400\,rpm\)
Explanation:
The \(emf\) induced is directly proportional to rate at whcih flux is intercepted which varies directly as the speed of rotation of the generator. New speed \( = \frac{{120}}{{100}} \times 1500 = 1800\,rpm\)
AIIMS - 2007
PHXII06:ELECTROMAGNETIC INDUCTION
358411
A generator has an \(e.m.f.\) of \(440\,volt\) and internal resistance of \(4000\,hm\). Its terminals are connected to a load of \(4000\,ohm\). The voltage across the load is
1 \(220\,volt\)
2 \(440\,volt\)
3 \(200\,volt\)
4 \(400\,volt\)
Explanation:
Total resistance of the circuit \( = 4000 + 400 = 4400\;W\) Current flowing \(i = \frac{V}{R} = \frac{{440}}{{4400}} = 0.1\,amp\). Voltage across load \( = Ri = 4000 \times 0.1 = 400\,volt.\)
PHXII06:ELECTROMAGNETIC INDUCTION
358412
Assertion : A dynamo converts mechanical energy into electrical energy. Reason : The dynamo is based on the principle of electromagnetic induction.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
Dynamo (as in old bicycle wheels) is a device designed to convert mechanical energy into electrical energy. When a conductor, typically a coil of wire, rotates within a magnetic field, it experiences a change in magnetic flux, inducing an electromotive force (emf) according to Faraday's law, Both Assertion and Reason are true and Reason is the correct explanation of Assertion. So correct option is (1).
PHXII06:ELECTROMAGNETIC INDUCTION
358413
A coil having number of turns \(N\) and cross-sectional area \(A\) is rotated in a uniform magnetic field \(B\) with an angular velocity \(\omega\). The maximum value of the emf induced in it is -
1 \(\frac{{NBA}}{\omega }\)
2 \(NBA\,\omega \)
3 \(\frac{{NBA}}{{{\omega ^2}}}\)
4 \(NBA\,{\omega ^2}\)
Explanation:
The flux linking with the coil at any instant \(t\) is given as \(\Phi = NBA\cos \omega t\) \(\therefore \varepsilon = - \frac{{d\Phi }}{{dt}} = NBA\sin \omega t\) Therefore, the maximum value of \(emf\) is \({\varepsilon _{\max }} = NBA\,\omega \)
358409
Which of the following is constructed on the principle of electromagnetic induction?
1 Voltmeter
2 Galvanometer
3 Generator
4 Electric motor
Explanation:
In a generator e.m.f. is induced according as Lenz's Law rule.
PHXII06:ELECTROMAGNETIC INDUCTION
358410
A six pole generator with fixed field excitation developes an \(emf\) of \(100\;V\) when operating at \(1500\,rpm\). At what speed must it rotate to develop \(120\;V\)?
1 \(1200\,rpm\)
2 \(1800\,rpm\)
3 \(1500\,rpm\)
4 \(400\,rpm\)
Explanation:
The \(emf\) induced is directly proportional to rate at whcih flux is intercepted which varies directly as the speed of rotation of the generator. New speed \( = \frac{{120}}{{100}} \times 1500 = 1800\,rpm\)
AIIMS - 2007
PHXII06:ELECTROMAGNETIC INDUCTION
358411
A generator has an \(e.m.f.\) of \(440\,volt\) and internal resistance of \(4000\,hm\). Its terminals are connected to a load of \(4000\,ohm\). The voltage across the load is
1 \(220\,volt\)
2 \(440\,volt\)
3 \(200\,volt\)
4 \(400\,volt\)
Explanation:
Total resistance of the circuit \( = 4000 + 400 = 4400\;W\) Current flowing \(i = \frac{V}{R} = \frac{{440}}{{4400}} = 0.1\,amp\). Voltage across load \( = Ri = 4000 \times 0.1 = 400\,volt.\)
PHXII06:ELECTROMAGNETIC INDUCTION
358412
Assertion : A dynamo converts mechanical energy into electrical energy. Reason : The dynamo is based on the principle of electromagnetic induction.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
Dynamo (as in old bicycle wheels) is a device designed to convert mechanical energy into electrical energy. When a conductor, typically a coil of wire, rotates within a magnetic field, it experiences a change in magnetic flux, inducing an electromotive force (emf) according to Faraday's law, Both Assertion and Reason are true and Reason is the correct explanation of Assertion. So correct option is (1).
PHXII06:ELECTROMAGNETIC INDUCTION
358413
A coil having number of turns \(N\) and cross-sectional area \(A\) is rotated in a uniform magnetic field \(B\) with an angular velocity \(\omega\). The maximum value of the emf induced in it is -
1 \(\frac{{NBA}}{\omega }\)
2 \(NBA\,\omega \)
3 \(\frac{{NBA}}{{{\omega ^2}}}\)
4 \(NBA\,{\omega ^2}\)
Explanation:
The flux linking with the coil at any instant \(t\) is given as \(\Phi = NBA\cos \omega t\) \(\therefore \varepsilon = - \frac{{d\Phi }}{{dt}} = NBA\sin \omega t\) Therefore, the maximum value of \(emf\) is \({\varepsilon _{\max }} = NBA\,\omega \)
358409
Which of the following is constructed on the principle of electromagnetic induction?
1 Voltmeter
2 Galvanometer
3 Generator
4 Electric motor
Explanation:
In a generator e.m.f. is induced according as Lenz's Law rule.
PHXII06:ELECTROMAGNETIC INDUCTION
358410
A six pole generator with fixed field excitation developes an \(emf\) of \(100\;V\) when operating at \(1500\,rpm\). At what speed must it rotate to develop \(120\;V\)?
1 \(1200\,rpm\)
2 \(1800\,rpm\)
3 \(1500\,rpm\)
4 \(400\,rpm\)
Explanation:
The \(emf\) induced is directly proportional to rate at whcih flux is intercepted which varies directly as the speed of rotation of the generator. New speed \( = \frac{{120}}{{100}} \times 1500 = 1800\,rpm\)
AIIMS - 2007
PHXII06:ELECTROMAGNETIC INDUCTION
358411
A generator has an \(e.m.f.\) of \(440\,volt\) and internal resistance of \(4000\,hm\). Its terminals are connected to a load of \(4000\,ohm\). The voltage across the load is
1 \(220\,volt\)
2 \(440\,volt\)
3 \(200\,volt\)
4 \(400\,volt\)
Explanation:
Total resistance of the circuit \( = 4000 + 400 = 4400\;W\) Current flowing \(i = \frac{V}{R} = \frac{{440}}{{4400}} = 0.1\,amp\). Voltage across load \( = Ri = 4000 \times 0.1 = 400\,volt.\)
PHXII06:ELECTROMAGNETIC INDUCTION
358412
Assertion : A dynamo converts mechanical energy into electrical energy. Reason : The dynamo is based on the principle of electromagnetic induction.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
Dynamo (as in old bicycle wheels) is a device designed to convert mechanical energy into electrical energy. When a conductor, typically a coil of wire, rotates within a magnetic field, it experiences a change in magnetic flux, inducing an electromotive force (emf) according to Faraday's law, Both Assertion and Reason are true and Reason is the correct explanation of Assertion. So correct option is (1).
PHXII06:ELECTROMAGNETIC INDUCTION
358413
A coil having number of turns \(N\) and cross-sectional area \(A\) is rotated in a uniform magnetic field \(B\) with an angular velocity \(\omega\). The maximum value of the emf induced in it is -
1 \(\frac{{NBA}}{\omega }\)
2 \(NBA\,\omega \)
3 \(\frac{{NBA}}{{{\omega ^2}}}\)
4 \(NBA\,{\omega ^2}\)
Explanation:
The flux linking with the coil at any instant \(t\) is given as \(\Phi = NBA\cos \omega t\) \(\therefore \varepsilon = - \frac{{d\Phi }}{{dt}} = NBA\sin \omega t\) Therefore, the maximum value of \(emf\) is \({\varepsilon _{\max }} = NBA\,\omega \)
