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Question

A wire of length L and 3 identical cells of negligible internal resistances are connected in series. Due to this current, the temperature of the wire is raised by ΔT in time t. A number N of similar cells is now connected in series with a wire of the same material and cross-section but of length 2L. The temperature of wire is raised by same amount ΔT in the same time t. The value of N is

A
4
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B
6
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C
8
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D
9
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Solution

The correct option is B 6
Heat =mSΔT=i2Rt
Case I: Length (L) Resistance = R and mass = m
Case II: Length (2L) Resistance = 2R and mass = 2m
So m1S1ΔT1m2S2ΔT2=i21R1t1i22R2t2mSΔT2mSΔT=i21Rti222Rti1=i2(3E)R=(NE)2RN=6

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