a) Points A and B are at 0.05m and 0.03m from a charge +13 x10-6C respectively. Determine the required work against the direction of the electric field to displace a charge +15 x10-6C from point A to point B.
b) A charge q1=+8 x10-6C is at the origin (x=0mm), and other charge q2=-3 x10-6C is at x=60mm. Find the work done by the electric field if a charge q3=-4 x10-6C is displaced from point x=15mm to point x=5mm.
a)
b)
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