A positive charge Q = 50 µC is located in the xy plane at a point having position vector 
= 
m where 
and 
are unit vectors in the positive directions of X and Y axis respectively. Find:
Text Solution
Verified by ExpertsThe correct answer is:
CHECK THE SOLUTION.
[ 450 
V/m, 4.5 k V/m
4.5 
= 1.579 J]
Sol. 
= 
∴ 
or 
= 4500 V/m = 4.5 kV/m
W ext = U f – U i = 
(where r 1 and r 2 distances of (8, 6) & (4, 3) from charge Q)
W ext = 9 × 10 9 × 10 × 10 –6 × 50 × 10 –6 
= 4.5 
= 1.579 J (approx.)
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