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Q.

A wire when connected to 220 V mains supply has power dissipation P1. Now the wire is cut into two equal pieces which are connected in parallel to the same supply. power dissipation in this case is P2. Then P2 : P1 is

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a

2

b

1

c

3

d

4

answer is B.

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Detailed Solution

When wire is cut into two equal parts, then power dissipated by each part is 2P1
So their parallel combination will dissipate power 
P2 = 2P1 + 2P1 = 4P1

Which gives P2P1=4

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