Question

Tow short electric dipoles are placed as shown The energy or electric interaction between these dipoles will be
` .
A. ` (2 k P_1p_2 cos theta)/r^2 `
B. ` (-2 kP1p_2 cos theta)/r^3`
C. `(-2 P_1p2 sin theta)/r^3`
D. ` (-4 kP_1P_2 cos theta)/r^3`

Answer 1

Correct Answer - B
Potenial energy of ` P_2` in the field of ` P_1`
` =- P_2 E_1 cos theta `
` =- P_2 (2 KP_1 cosq)/r^3`
` U=- (2 KP_1OP_2)/r^3 cos theta` .