A point charge 2 × 10⁻² C is moved from P to S in a uniform electric field of 30 N C⁻¹ directed along positive x-axis. If coordinates of P and S are (1, 2, 0) m and (0, 0, 0) m respectively, the work done by electric field will be:
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Question

A point charge 2 × 10⁻² C is moved from P to S in a uniform electric field of 30 N C⁻¹ directed along positive x-axis. If coordinates of P and S are (1, 2, 0) m and (0, 0, 0) m respectively, the work done by electric field will be:

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G1 Physics · Accepted Answer

Displacement from P to S is Δr = (−1î − 2ĵ) m. Work done by the electric field is W = q E·Δr = (2 × 10⁻²)(30î)·(−1î − 2ĵ) = −0.6 J = −600 mJ.