154262
In a moving coil galvanometer, to make the field radial
1 coil is wound on wooden frame
2 magnetic poles are cylindrically cut
3 a horse shoe magnet is used
4 the number of windings in the coil is decreased
Explanation:
B In a moving coil galvanometer to obtain the radial magnetic field, the poles of the magnet are cut cylindrical.
J and K CET- 2009
Magnetism and Matter
154263
To convert a moving coil galvanometer (MCG) into a voltmeter OR A voltmeter essentially consists of
1 a high resistance $\mathrm{R}$ is connected in parallel with MCG
2 a low resistance $\mathrm{R}$ is connected in parallel with MCG
3 a low resistance $\mathrm{R}$ is connected in series with MCG
4 a high resistance $\mathrm{R}$ is connected in series with $\mathrm{MCG}$
Explanation:
D A good voltmeter has very high resistance. So a moving coil galvanometer is converted into a voltmeter by connecting a high resistance in series with the galvanometer resistance.
J and K CET- 2008
Magnetism and Matter
154251
Assertion : The sensitivity of a moving coil galvanometer is increased by placing a suitable magnetic material as a core inside the coil. Reason : Soft iron has high magnetic permeability and cannot be easily magnetized or demagnetized.
1 If both Assertion and Reason are correct and reason is the correct explanation of Assertion.
2 If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion
3 If Assertion is correct but Reason is incorrect
4 If both the Assertion and Reason are incorrect
Explanation:
C The Sensitivity of a moving coil galvanometer is given by $\frac{\mathrm{NAB}}{\mathrm{C}}$. By placing a soft iron core. We increase the strength of the magnetic field. This make the galvanometer more sensitive. Hence assertion is correct. Soft iron core has low retentivity. Therefore it can be easily magnetized or de magnetized. Hence reason is incorrect
154262
In a moving coil galvanometer, to make the field radial
1 coil is wound on wooden frame
2 magnetic poles are cylindrically cut
3 a horse shoe magnet is used
4 the number of windings in the coil is decreased
Explanation:
B In a moving coil galvanometer to obtain the radial magnetic field, the poles of the magnet are cut cylindrical.
J and K CET- 2009
Magnetism and Matter
154263
To convert a moving coil galvanometer (MCG) into a voltmeter OR A voltmeter essentially consists of
1 a high resistance $\mathrm{R}$ is connected in parallel with MCG
2 a low resistance $\mathrm{R}$ is connected in parallel with MCG
3 a low resistance $\mathrm{R}$ is connected in series with MCG
4 a high resistance $\mathrm{R}$ is connected in series with $\mathrm{MCG}$
Explanation:
D A good voltmeter has very high resistance. So a moving coil galvanometer is converted into a voltmeter by connecting a high resistance in series with the galvanometer resistance.
J and K CET- 2008
Magnetism and Matter
154251
Assertion : The sensitivity of a moving coil galvanometer is increased by placing a suitable magnetic material as a core inside the coil. Reason : Soft iron has high magnetic permeability and cannot be easily magnetized or demagnetized.
1 If both Assertion and Reason are correct and reason is the correct explanation of Assertion.
2 If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion
3 If Assertion is correct but Reason is incorrect
4 If both the Assertion and Reason are incorrect
Explanation:
C The Sensitivity of a moving coil galvanometer is given by $\frac{\mathrm{NAB}}{\mathrm{C}}$. By placing a soft iron core. We increase the strength of the magnetic field. This make the galvanometer more sensitive. Hence assertion is correct. Soft iron core has low retentivity. Therefore it can be easily magnetized or de magnetized. Hence reason is incorrect
154262
In a moving coil galvanometer, to make the field radial
1 coil is wound on wooden frame
2 magnetic poles are cylindrically cut
3 a horse shoe magnet is used
4 the number of windings in the coil is decreased
Explanation:
B In a moving coil galvanometer to obtain the radial magnetic field, the poles of the magnet are cut cylindrical.
J and K CET- 2009
Magnetism and Matter
154263
To convert a moving coil galvanometer (MCG) into a voltmeter OR A voltmeter essentially consists of
1 a high resistance $\mathrm{R}$ is connected in parallel with MCG
2 a low resistance $\mathrm{R}$ is connected in parallel with MCG
3 a low resistance $\mathrm{R}$ is connected in series with MCG
4 a high resistance $\mathrm{R}$ is connected in series with $\mathrm{MCG}$
Explanation:
D A good voltmeter has very high resistance. So a moving coil galvanometer is converted into a voltmeter by connecting a high resistance in series with the galvanometer resistance.
J and K CET- 2008
Magnetism and Matter
154251
Assertion : The sensitivity of a moving coil galvanometer is increased by placing a suitable magnetic material as a core inside the coil. Reason : Soft iron has high magnetic permeability and cannot be easily magnetized or demagnetized.
1 If both Assertion and Reason are correct and reason is the correct explanation of Assertion.
2 If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion
3 If Assertion is correct but Reason is incorrect
4 If both the Assertion and Reason are incorrect
Explanation:
C The Sensitivity of a moving coil galvanometer is given by $\frac{\mathrm{NAB}}{\mathrm{C}}$. By placing a soft iron core. We increase the strength of the magnetic field. This make the galvanometer more sensitive. Hence assertion is correct. Soft iron core has low retentivity. Therefore it can be easily magnetized or de magnetized. Hence reason is incorrect
