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Question

In the moving coil galvanometer
N= number of turns; A= cross sectional area; B= Magnetic field; C= Torsional constant; I= current, R= resistance

List IList II
(P) Torque action on the coil(1)NAB /C
(Q)Deflection produced (2)NAB/CR
(R)Current sensitivity(3)NIAB
(S)Voltage sensitivity (4)NABI/C

A
P- 3, Q- 1, R- 2, S- 4
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B
P- 2, Q- 1, R- 3, S- 4
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C
P- 3, Q- 4, R- 1, S- 2
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D
P- 4, Q- 1, R- 2, S- 3
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Solution

The correct option is C P- 3, Q- 4, R- 1, S- 2
Here,
Torque=\overrightarrow p\times B$

τ=IABN
P3

Also,
τ=cθ
Where, c=torsional constant,

θ=NIABc

Q4

Current sensitivity=θI

=NABc

R1

Voltage sensitivity=Current sensitivityR

=NABcR

S2


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