Two charges q1 and q2 are placed 30cm apart
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Two charges q1 and q2 are placed 30cm apart. A third charge q3 is moved along the arc of a circle of radius 40cm frm C to D. The change in the potential energy of the system is q3 k/4 pi epsilon0, where 'k' is :
a) 8 q1.
b) 6 q1.
c) 8 q2.
d) 6 q2.