Four identical charges 
each are placed, one at each corner of a square of side 2 m. How much external energy is required to bring another charge of 
from infinity to the centre of the square?
Text Solution
Verified by ExpertsThe correct answer is:
A
Potential at center, 
Potential at the center of square,
Work done in bringing a charge ( 
) from 
to centre of the square is
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