358417
A 100 millihenry coil carries a current of 1 ampere. Energy stored in its magnetic field is
1 \(0.5\;J\)
2 \(1\;J\)
3 \(0.05\;J\)
4 \(0.1\;J\)
Explanation:
Energy stored \(U\) is given by \(U = \frac{1}{2}L{i^2} = \frac{1}{2} \times \left( {100 \times {{10}^{ - 3}}} \right){(1)^2} = 0.05\;J\)
PHXII06:ELECTROMAGNETIC INDUCTION
358418
Assertion : The energy stored in the inductor of \(2\,H\), when a currnt of \(10\;A\) flows through it is \(100\;J\) Reason : Energy stored in an inductor is directly proportional to its inductance.
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:
Energy \(=\dfrac{1}{2} L i^{2}=\dfrac{1}{2} \times 2 \times(10)^{2}=100 J\) So option (2) is correct.
PHXII06:ELECTROMAGNETIC INDUCTION
358419
An electromagnet has stored \(648\;\,J\) of magnetic energy when a current of 9 \(A\) exists in its coils. What average emf is induced if the current is reduced to zero in 0.45 ?
358421
The magnetic potential energy stored in a certain inductor is \(25\;mJ\), when the current in the inductor is \(60\;\,mA\). This inductor is of inductance
358417
A 100 millihenry coil carries a current of 1 ampere. Energy stored in its magnetic field is
1 \(0.5\;J\)
2 \(1\;J\)
3 \(0.05\;J\)
4 \(0.1\;J\)
Explanation:
Energy stored \(U\) is given by \(U = \frac{1}{2}L{i^2} = \frac{1}{2} \times \left( {100 \times {{10}^{ - 3}}} \right){(1)^2} = 0.05\;J\)
PHXII06:ELECTROMAGNETIC INDUCTION
358418
Assertion : The energy stored in the inductor of \(2\,H\), when a currnt of \(10\;A\) flows through it is \(100\;J\) Reason : Energy stored in an inductor is directly proportional to its inductance.
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:
Energy \(=\dfrac{1}{2} L i^{2}=\dfrac{1}{2} \times 2 \times(10)^{2}=100 J\) So option (2) is correct.
PHXII06:ELECTROMAGNETIC INDUCTION
358419
An electromagnet has stored \(648\;\,J\) of magnetic energy when a current of 9 \(A\) exists in its coils. What average emf is induced if the current is reduced to zero in 0.45 ?
358421
The magnetic potential energy stored in a certain inductor is \(25\;mJ\), when the current in the inductor is \(60\;\,mA\). This inductor is of inductance
358417
A 100 millihenry coil carries a current of 1 ampere. Energy stored in its magnetic field is
1 \(0.5\;J\)
2 \(1\;J\)
3 \(0.05\;J\)
4 \(0.1\;J\)
Explanation:
Energy stored \(U\) is given by \(U = \frac{1}{2}L{i^2} = \frac{1}{2} \times \left( {100 \times {{10}^{ - 3}}} \right){(1)^2} = 0.05\;J\)
PHXII06:ELECTROMAGNETIC INDUCTION
358418
Assertion : The energy stored in the inductor of \(2\,H\), when a currnt of \(10\;A\) flows through it is \(100\;J\) Reason : Energy stored in an inductor is directly proportional to its inductance.
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:
Energy \(=\dfrac{1}{2} L i^{2}=\dfrac{1}{2} \times 2 \times(10)^{2}=100 J\) So option (2) is correct.
PHXII06:ELECTROMAGNETIC INDUCTION
358419
An electromagnet has stored \(648\;\,J\) of magnetic energy when a current of 9 \(A\) exists in its coils. What average emf is induced if the current is reduced to zero in 0.45 ?
358421
The magnetic potential energy stored in a certain inductor is \(25\;mJ\), when the current in the inductor is \(60\;\,mA\). This inductor is of inductance
358417
A 100 millihenry coil carries a current of 1 ampere. Energy stored in its magnetic field is
1 \(0.5\;J\)
2 \(1\;J\)
3 \(0.05\;J\)
4 \(0.1\;J\)
Explanation:
Energy stored \(U\) is given by \(U = \frac{1}{2}L{i^2} = \frac{1}{2} \times \left( {100 \times {{10}^{ - 3}}} \right){(1)^2} = 0.05\;J\)
PHXII06:ELECTROMAGNETIC INDUCTION
358418
Assertion : The energy stored in the inductor of \(2\,H\), when a currnt of \(10\;A\) flows through it is \(100\;J\) Reason : Energy stored in an inductor is directly proportional to its inductance.
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:
Energy \(=\dfrac{1}{2} L i^{2}=\dfrac{1}{2} \times 2 \times(10)^{2}=100 J\) So option (2) is correct.
PHXII06:ELECTROMAGNETIC INDUCTION
358419
An electromagnet has stored \(648\;\,J\) of magnetic energy when a current of 9 \(A\) exists in its coils. What average emf is induced if the current is reduced to zero in 0.45 ?
358421
The magnetic potential energy stored in a certain inductor is \(25\;mJ\), when the current in the inductor is \(60\;\,mA\). This inductor is of inductance
358417
A 100 millihenry coil carries a current of 1 ampere. Energy stored in its magnetic field is
1 \(0.5\;J\)
2 \(1\;J\)
3 \(0.05\;J\)
4 \(0.1\;J\)
Explanation:
Energy stored \(U\) is given by \(U = \frac{1}{2}L{i^2} = \frac{1}{2} \times \left( {100 \times {{10}^{ - 3}}} \right){(1)^2} = 0.05\;J\)
PHXII06:ELECTROMAGNETIC INDUCTION
358418
Assertion : The energy stored in the inductor of \(2\,H\), when a currnt of \(10\;A\) flows through it is \(100\;J\) Reason : Energy stored in an inductor is directly proportional to its inductance.
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:
Energy \(=\dfrac{1}{2} L i^{2}=\dfrac{1}{2} \times 2 \times(10)^{2}=100 J\) So option (2) is correct.
PHXII06:ELECTROMAGNETIC INDUCTION
358419
An electromagnet has stored \(648\;\,J\) of magnetic energy when a current of 9 \(A\) exists in its coils. What average emf is induced if the current is reduced to zero in 0.45 ?
358421
The magnetic potential energy stored in a certain inductor is \(25\;mJ\), when the current in the inductor is \(60\;\,mA\). This inductor is of inductance
