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Question

A point charge q moves from ‘P’ to ‘S’ along path PQRS in a uniform electric field E directied parallel to positive X-axis. The co-ordinates of the points P.Q.R and S are (a, b, 0), (2a, 0, 0), (0, –b, 0) and (0, 0, 0) respectively. The work done by field in the above process is given by
  1. qEa
  2. qEa
  3. qEa2
  4. qE(2a)2+b2


Solution

The correct option is B qEa
W=F.S             S=a^ib^j
W=(qE^i).(a^ib^j)            F=qE
W=aqE

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