Moving Coil Galvanometer & Its Applications
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PHXII04:MOVING CHARGES AND MAGNETISM

362981 Certain galvanometers have a fixed core made of non-magnetic metallic material. The function of this metallic material is

1 to make the magnetic field radial
2 to oscillate the coil in magnetic field for longer period of time
3 to produce large deflecting torque on the coil
4 to bring the coil to rest quickly.
JEE - 2023
PHXII04:MOVING CHARGES AND MAGNETISM

362982 A moving coil galvanometer has 100 turns and each turns has an area of \(2\;c{m^2}\). The magnetic field produced by the magnet is \(0.01\;T\). The deflection in the galvanometer coil is \(0.05\,rad\) when a current of 10\(mA\) is passed through it. The torsional constant of the spiral spring is

1 \(4 \times {10^{ - 5}}Nmra{d^{ - 1}}\)
2 \(3.0 \times {10^{ - 4}}Nmra{d^{ - 1}}\)
3 \(7 \times {10^{ - 7}}Nmra{d^{ - 1}}\)
4 \(5 \times {10^{ - 6}}Nmra{d^{ - 1}}\)
PHXII04:MOVING CHARGES AND MAGNETISM

362983 To increase the current sensitivity of a moving coil galvanometer by \(50 \%\), its resistance becomes twice its initial resistance. By what factor does the voltage sensitivity change?

1 Increasesd by \(75 \%\)
2 Decreased by \(75 \%\)
3 Increased by \(25 \%\)
4 Decreased by \(25 \%\)
PHXII04:MOVING CHARGES AND MAGNETISM

362984 The area of the coil in a moving coil galvanometer is \(15\,c{m^2}\) and has 20 turns. The magnetic induction is \(0.2 T\) and the couple per unit twist of the suspended wire is \({10^{ - 6}}Nm\) per degree. If the deflection is \(45^{\circ}\), the current passing through it is

1 \(7.5 \times {10^{ - 4}}\;A\)
2 \(750 \times {10^{ - 4}}\;A\)
3 \(75 \times {10^{ - 4}}\;A\)
4 \(0.75 \times {10^{ - 4}}\;A\)
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PHXII04:MOVING CHARGES AND MAGNETISM

362981 Certain galvanometers have a fixed core made of non-magnetic metallic material. The function of this metallic material is

1 to make the magnetic field radial
2 to oscillate the coil in magnetic field for longer period of time
3 to produce large deflecting torque on the coil
4 to bring the coil to rest quickly.
JEE - 2023
PHXII04:MOVING CHARGES AND MAGNETISM

362982 A moving coil galvanometer has 100 turns and each turns has an area of \(2\;c{m^2}\). The magnetic field produced by the magnet is \(0.01\;T\). The deflection in the galvanometer coil is \(0.05\,rad\) when a current of 10\(mA\) is passed through it. The torsional constant of the spiral spring is

1 \(4 \times {10^{ - 5}}Nmra{d^{ - 1}}\)
2 \(3.0 \times {10^{ - 4}}Nmra{d^{ - 1}}\)
3 \(7 \times {10^{ - 7}}Nmra{d^{ - 1}}\)
4 \(5 \times {10^{ - 6}}Nmra{d^{ - 1}}\)
PHXII04:MOVING CHARGES AND MAGNETISM

362983 To increase the current sensitivity of a moving coil galvanometer by \(50 \%\), its resistance becomes twice its initial resistance. By what factor does the voltage sensitivity change?

1 Increasesd by \(75 \%\)
2 Decreased by \(75 \%\)
3 Increased by \(25 \%\)
4 Decreased by \(25 \%\)
PHXII04:MOVING CHARGES AND MAGNETISM

362984 The area of the coil in a moving coil galvanometer is \(15\,c{m^2}\) and has 20 turns. The magnetic induction is \(0.2 T\) and the couple per unit twist of the suspended wire is \({10^{ - 6}}Nm\) per degree. If the deflection is \(45^{\circ}\), the current passing through it is

1 \(7.5 \times {10^{ - 4}}\;A\)
2 \(750 \times {10^{ - 4}}\;A\)
3 \(75 \times {10^{ - 4}}\;A\)
4 \(0.75 \times {10^{ - 4}}\;A\)
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PHXII04:MOVING CHARGES AND MAGNETISM

362981 Certain galvanometers have a fixed core made of non-magnetic metallic material. The function of this metallic material is

1 to make the magnetic field radial
2 to oscillate the coil in magnetic field for longer period of time
3 to produce large deflecting torque on the coil
4 to bring the coil to rest quickly.
JEE - 2023
PHXII04:MOVING CHARGES AND MAGNETISM

362982 A moving coil galvanometer has 100 turns and each turns has an area of \(2\;c{m^2}\). The magnetic field produced by the magnet is \(0.01\;T\). The deflection in the galvanometer coil is \(0.05\,rad\) when a current of 10\(mA\) is passed through it. The torsional constant of the spiral spring is

1 \(4 \times {10^{ - 5}}Nmra{d^{ - 1}}\)
2 \(3.0 \times {10^{ - 4}}Nmra{d^{ - 1}}\)
3 \(7 \times {10^{ - 7}}Nmra{d^{ - 1}}\)
4 \(5 \times {10^{ - 6}}Nmra{d^{ - 1}}\)
PHXII04:MOVING CHARGES AND MAGNETISM

362983 To increase the current sensitivity of a moving coil galvanometer by \(50 \%\), its resistance becomes twice its initial resistance. By what factor does the voltage sensitivity change?

1 Increasesd by \(75 \%\)
2 Decreased by \(75 \%\)
3 Increased by \(25 \%\)
4 Decreased by \(25 \%\)
PHXII04:MOVING CHARGES AND MAGNETISM

362984 The area of the coil in a moving coil galvanometer is \(15\,c{m^2}\) and has 20 turns. The magnetic induction is \(0.2 T\) and the couple per unit twist of the suspended wire is \({10^{ - 6}}Nm\) per degree. If the deflection is \(45^{\circ}\), the current passing through it is

1 \(7.5 \times {10^{ - 4}}\;A\)
2 \(750 \times {10^{ - 4}}\;A\)
3 \(75 \times {10^{ - 4}}\;A\)
4 \(0.75 \times {10^{ - 4}}\;A\)
For More Updates join with Us
PHXII04:MOVING CHARGES AND MAGNETISM

362981 Certain galvanometers have a fixed core made of non-magnetic metallic material. The function of this metallic material is

1 to make the magnetic field radial
2 to oscillate the coil in magnetic field for longer period of time
3 to produce large deflecting torque on the coil
4 to bring the coil to rest quickly.
JEE - 2023
PHXII04:MOVING CHARGES AND MAGNETISM

362982 A moving coil galvanometer has 100 turns and each turns has an area of \(2\;c{m^2}\). The magnetic field produced by the magnet is \(0.01\;T\). The deflection in the galvanometer coil is \(0.05\,rad\) when a current of 10\(mA\) is passed through it. The torsional constant of the spiral spring is

1 \(4 \times {10^{ - 5}}Nmra{d^{ - 1}}\)
2 \(3.0 \times {10^{ - 4}}Nmra{d^{ - 1}}\)
3 \(7 \times {10^{ - 7}}Nmra{d^{ - 1}}\)
4 \(5 \times {10^{ - 6}}Nmra{d^{ - 1}}\)
PHXII04:MOVING CHARGES AND MAGNETISM

362983 To increase the current sensitivity of a moving coil galvanometer by \(50 \%\), its resistance becomes twice its initial resistance. By what factor does the voltage sensitivity change?

1 Increasesd by \(75 \%\)
2 Decreased by \(75 \%\)
3 Increased by \(25 \%\)
4 Decreased by \(25 \%\)
PHXII04:MOVING CHARGES AND MAGNETISM

362984 The area of the coil in a moving coil galvanometer is \(15\,c{m^2}\) and has 20 turns. The magnetic induction is \(0.2 T\) and the couple per unit twist of the suspended wire is \({10^{ - 6}}Nm\) per degree. If the deflection is \(45^{\circ}\), the current passing through it is

1 \(7.5 \times {10^{ - 4}}\;A\)
2 \(750 \times {10^{ - 4}}\;A\)
3 \(75 \times {10^{ - 4}}\;A\)
4 \(0.75 \times {10^{ - 4}}\;A\)