Q.

A lamp radiates power  P0 uniformly in all directions, the amplitude of electric field strength E0 at a  distance  r from  it is

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a

P02πε0cr2

b

P02πε0cr2

c

P04πε0cr2

d

P08πε0cr2

answer is B.

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Detailed Solution

I0=12ε0E02 CP04πr2=12ε0E02CEo=P02πε0cr2
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A lamp radiates power  P0 uniformly in all directions, the amplitude of electric field strength E0 at a  distance  r from  it is