1.

Electric charges of + 10 mu C,+ 5 mu C, - 3 mu C and + 8 mu C are placed at the corners of a square of side sqrt2m. The potential at the centre of the square is

Answer»

`1.8 V`
`1.8 xx 10^6 V`
`1.8 xx 10^5 V`
`1.8 xx 10^4 V`

Solution :As shown in Figure distance of centre point O from any vertex of square ABCD
`R = a/sqrt2 = sqrt2/sqrt2 =1m`
` :.` Potential at O, `V = 1/( 4 pi epsi_0.r)[q_1 + q_2 + q_3 + q_4]`
` = (9 xx 10^9)/1 [ 10+ 5- 3+ 8] xx 10^(-6) = 1.8 xx 10^5 V`


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