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Q.

The resistance of a coil is 4.2Ω at 100°C and the temperature coefficient of resistance of its material is 0.004/°C. Its resistance at 0°C is

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a

3Ω

b

6.5Ω

c

2.5Ω

d

5Ω

answer is C.

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Detailed Solution

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Rt=R0[1+αt];4.2=R0[1+0.004×100]R0=3Ω

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