Q.12. Work done in moving an electric charge in an electric field.

Question 12:

An infinite long plate has surface charge density σ . As shown in the figure, a point charge q is moved from A to B. Net work done by electric field is:

Answer 12:

Electric intensity at any point is constant = σ /2εo and is directed perpendicularly away from the plate.

Net work done

= electric intensity x charge x displacement in the direction of intensity

= (σ /2εo) * q * (x1 - x2).

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