JEE Main · 2021 · 27 Aug 2021 · Shift 2 · Current Electricity

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For full scale deflection of total 50 divisions, 50 mV voltage is required in galvanometer. The resistance of galvanometer if its current sensitivity is 2 div/mA will be :

(A) $2Ω$ ✓ Correct
(B) $4Ω$
(C) $1Ω$
(D) $5Ω$

Answer: (A)

Solution

The current sensitivity

2

div/mA means a full-scale deflection of

50

divisions corresponds to

I_{g} = \frac{50}{2} = 25

= 0.025

A. The galvanometer resistance follows from the full-scale voltage

50

= 0.05

R_{g} = \frac{V}{I _{g}} = \frac{0.05}{0.025} = 2 Ω.

The galvanometer resistance is

2 Ω

JEE Main · 2021 · 27 Aug 2021 · Shift 2 · Single correct option

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