An electric cell of e.m.f. E is connected across a copper wire of diameter d and length 1. The drift velocity of electrons in the wire is vd. If the length of the wire is changed to 2L, the new drift velocity of electrons in the copper wire will be

Question:

Options :

a)vd
b)2vd
c)vd/2
d)vd/4

Answer :

c)vd/2

Answer Steps :

Step:-1

Step:-2

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Forty electric bulbs are connected in series across a 220 V supply. After one bulb is fused, the remaining 39 are connected again in series across the same supply. The illumination will be

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