1.

The displacement bar(r ) of a charge Q in an electric field E= e_(1) hat(i) + e_(2) hat(j) + e_(3) hat(k) " is " bar(r )= a hat(i) + b hat(j). The work done is

Answer»

`Q(a e_(1) + B e_(2))`
`Q SQRT((a e_(1))^(2) + (b e_(2))^(2))`
`Q (e_(1) + e_(2)) sqrt(a^(2) + b^(2))`
`(e_(1)^(2) + e_(2)^(2)) (a + b)`

ANSWER :A


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