A moving coil galvanometer has following characteristics-Number of turns - 80- Area of coil -50 mm2- Resistance of coil - 20 - magnetic field - 0-2 T- torsional constant of the suspension wire - 5- 10-9 N-m-rad-Which of the following statements are correct-

We know that current sensitivity is given by, I_s=θi=NABC I_s=80× 50×10^ 6×0.25×10^ 9 I_s=160× 10^3 div/A=160 div/mA Now, voltage sensitivity is given by, ...

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Standard XII

Physics

Two Parallel Currents

A moving coil...

Question

A moving coil galvanometer has following characteristics,
Number of turns = $80$ , Area of coil = $50 {mm}^{2}$ , Resistance of coil = $20 Ω$ , magnetic field = $0.2 T$ , torsional constant of the suspension wire = $5 \times 10^{- 9} N-m/rad$ .
Which of the following statements are correct.

The angular deflection produced due to a potential difference of

0.01 mV

0.08 div

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Current sensitivity of the device is

160 div/mA

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Voltage sensitivity of the device is

8 div/mV

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All of the above.

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Solution

The correct option is D All of the above.
We know that current sensitivity is given by,

$I_{s} = \frac{θ}{i} = \frac{N A B}{C}$

$I_{s} = \frac{80 \times 50 \times 10^{- 6} \times 0.2}{5 \times 10^{- 9}}$

$I_{s} = 160 \times 10^{3} div/A = 160 div/mA$

Now, voltage sensitivity is given by,

$V_{s} = \frac{θ}{V} = \frac{I_{s}}{R} = \frac{N A B}{C R}$

$V_{s} = \frac{160}{20} = 8 div/mV$

If $V = 0.01 mV$ ,

$θ = 8 \times 0.01 = 0.08 div$

Hence, option $(D)$ is the correct answer.

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List I		List 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

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Two Parallel Currents

Standard XII Physics

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A moving coil galvanometer has following characteristics, Number of turns = 80, Area of coil =50 mm2, Resistance of coil = 20 Ω, magnetic field = 0.2 T, torsional constant of the suspension wire = 5×10−9 N-m/rad. Which of the following statements are correct.

A moving coil galvanometer has following characteristics,
Number of turns = $80$ , Area of coil = $50 {mm}^{2}$ , Resistance of coil = $20 Ω$ , magnetic field = $0.2 T$ , torsional constant of the suspension wire = $5 \times 10^{- 9} N-m/rad$ .
Which of the following statements are correct.