An electric dipole of length 20 cm having +3x103 C charge placed at 60° with respect to a uniform
electric field experiences a torque of magnitude 6 Nm. The potential energy of the dipole is
(B) 573J
(A) -2/3J
(C) -32J
(D) 35J
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An electric dipole of length 20 cm having +3x103 C charge placed at 60° with respect to a uniform
electric field experiences a torque of magnitude 6 Nm. The potential energy of the dipole is
(B) 573J
(A) -2/3J
(C) -32J
(D) 35J
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Answer:
(C) -32J
Explanation:
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ANSWER: B -2√3 j
explanation:
Here length of dipole 2a=20cm=20×10 −2
m, Charge q=±3×10 −3 C,θ=60°
and torque τ=6Nm
As τ=pEsinθ
E= psinθ
τ = q(2a)sin. (∵p=q(2a))
___________6____________
∴E= 3×10 −3 ×20×10 −2 ×sin60°
=10^5/5√3 NC-1
Potential energy of dipole U=−pEcosθ=−q(2a)Ecosθ
=−3×10 −3 (20×10 −2)10^5/5√3cos 60°
=-2√3 j