1.

Electric charges of +10pC,+54AC,-34C and +8C areplaced at the comers of a square of side 2 m. the potentialat the centre of the square isKCET (Engg Med.) 1999: MP PET 2006

Answer»

Let P be the center of square ABCDThen diagonal of square of length sqrt(2) m = 2m

PA = PB = PC = PD = 1/2 diagonal = 1 m

Potential at P due to all the charges= 9 * 10^9 (10/1 + 5/1 - 3/1 + 8/1)= 9*10^9 (23 - 3)= 180 * 10^9



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