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(a) Calculate the potential at a point P due to a charge of 4 × 10–7C
located 9 cm away (b) Hence obtain the work done in bringing a charge of 2 × 10–9 C
from infinity to the point P Does the answer depend on the path
along which the charge is brought Solution
(a)  
          = 4 × 104 V
(b) W = qV = 2 × 10–9C × 4 × 104V
     = 8 × 10–5 J
No, work done will be path independent