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If l = 60 cm when galvanometer shows null deflection then find R?

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+1 vote
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in Physics by (14.2k points)

null deflection

If l = 60 cm when galvanometer shows null deflection then find R?

(1) 4Ω

(2) 3 Ω

(3) 5 Ω

(4) 6 Ω

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1 Answer

+1 vote
by (18.5k points)

The correct option is (2) 3 Ω

\(\frac{4.5}{R} = \frac{60}{40}\)

4.5 x 40 = R x 60

R = 3Ω

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