A point charge of 2 mC moves from point P to point S along the path PQRS in a uniform electric field of 3 × 106 N C–1, as shown in the figure. The co-ordinates of points P, Q, R and S are (0, 0, 0), (1, –1, 0), (2, 0, 0) and (1, 1, 0) respectively. The work done (in J) by the electric field in the process is
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Answer:
Work done
E
is independent of path.
W
PQRS
=W
PS
=q[E
x
d
x
+E
y
d
y
+E
z
d
z
]=q[E(−a)+0+0]=−qEa
Negative sign here shows that work has been done against field.
Explanation:
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