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The current sensitivity of a moving coil galvanometer increases by 20% when its resistance is doubled. Calculate, by what factor does the voltage sensitivity change?

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Important Questions on Moving Charges and Magnetism

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Gamma Question Bank for Medical Physics>Chapter 19 - Moving Charges and Magnetism>Assignment>Q 1
The power supplied by the magnetic force acting on a moving charged particle
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Gamma Question Bank for Medical Physics>Chapter 19 - Moving Charges and Magnetism>Assignment>Q 2
When a charged particle enters a uniform magnetic field
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Gamma Question Bank for Medical Physics>Chapter 19 - Moving Charges and Magnetism>Assignment>Q 3
The time period of a charge particle which is. projected in a magnetic field B with velocity v→ at an angle θ with the direction of magnetic field is
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Gamma Question Bank for Medical Physics>Chapter 19 - Moving Charges and Magnetism>Assignment>Q 4
An electron moving with constant velocity passes through a region of space without change in its velocity. If E and B represent electric and magnetic field respectively, the region of space may have
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Gamma Question Bank for Medical Physics>Chapter 19 - Moving Charges and Magnetism>Assignment>Q 5
Ratio of magnetic fields at 10 cm and 20 cm from a infinitely long current carrying wire is
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Gamma Question Bank for Medical Physics>Chapter 19 - Moving Charges and Magnetism>Assignment>Q 6
A current I flows in a circular arc of wire whose radius is R, which subtends an angle 2π9 radian at its centre. The magnetic field B at the centre is
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Gamma Question Bank for Medical Physics>Chapter 19 - Moving Charges and Magnetism>Assignment>Q 7

The magnitude of magnetic field induction at the centre O in the figure shown is (Given: R1=10 cm, R2=20 cm and i=1 A)

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Gamma Question Bank for Medical Physics>Chapter 19 - Moving Charges and Magnetism>Assignment>Q 8
Two long wires one carrying current 1 A and other carrying 2 A in the same direction are placed parallel to each other produces a net magnetic field B at the mid-point. What will be the field at midpoint when current 1 A is switched off ?