A p.d. of 10 V is needed to make a current of 0.02 A flow through a wire. What p.d. is needed to make a current of 250 mA flow through the same wire?

Here I1 = 0.02 amp, V1 = 10 volt

V=IR



Again


Here I2 = 250mA=0.25A, R = 500


V2=I2R =0.25×500=125V


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