an electric dipole is placed in an electric field generated by a point charge. choose the correct option,
a) the net electric force on the dipole must be zero.
b) the net electric force on the dipole may be zero.
c) the torque on the dipole due to the field must be zero.
d) the torque on the dipole due to the filed may be be zero.
plz give reason also

Question

Nikola Tesla · Answer

Here is a complete answer.

a & b: Cannot be true in any case. Because for the net force on a dipole to be zero, the field lines shoould be parallel to eachother and the dipole must be placed perpendicular to the field. However, in the case of a point charge you cannot have parallel field lines.

c: Not true again. Because in any orientation(except radial) the force on the positive and negative charge will form a couple and you WILL have torque

d: TRUE! if you place the dipole radial from the point object then there will be no net torque! Since torque= F*Rsin(theta). If it is radial sin(theta) is zero

Krish Gupta · Answer

The complete answer is :-

a & b: Cannot be true in any case. Because for the net force on a dipole to be zero, the field lines shoould be parallel to eachother and the dipole must be placed perpendicular to the field. However, in the case of a point charge you cannot have parallel field lines.

c: Not true again. Because in any orientation(except radial) the force on the positive and negative charge will form a couple and you WILL have torque

d: TRUE! if you place the dipole radial from the point object then there will be no net torque! Since torque= F*Rsin(theta). If it is radial sin(theta) is zero

Thank you for registering.

Register Now and Win Upto 25% Scholorship for a Full Academic Year !

Enter Your Details

Registration done!

2 Answers

Think You Can Provide A Better Answer ?

Provide a better Answer & Earn Cool Goodies See our forum point policy

Other Related Questions on Electrostatics

ASK QUESTION

Answer and earn gift vouchers

View courses by askIITians

Design classes One-on-One in your own way with Top IITians/Medical Professionals

Complete Self Study Package designed by Industry Leading Experts

Live 1-1 coding classes to unleash the Creator in your Child

a Complete All-in-One Study package Fully Loaded inside a Tablet!

Register Now & Win Upto 25% Scholorship