Q.

A cell of resistance 3Ω and emf 10 volt is connected to a uniform wire of length 500 cm and resistance 3 ohm. The potential gradient in the wire is

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a

30 mV/m

b

2 mV/m

c

10 mV/cm

d

5 V/m

answer is C.

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Detailed Solution

Potential gradient VL=ER+rrL=10×3(3+3)×5⇒306×5=1Vm−1⇒V=10mV/cm
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A cell of resistance 3Ω and emf 10 volt is connected to a uniform wire of length 500 cm and resistance 3 ohm. The potential gradient in the wire is