Question
Fri February 15, 2013 By:

# ques1. In which orientation, a dipole placed in a uniform electric field is in 1. STABLE 2.UNSTABLE equilibrium? ques2. State Guass's law . obtain the expression for electric field due to a uniform field charged their spherical shell of radius R at a point r outside the shell.draw a graph showing the variation of electric field with r,for r>R , r

Tue February 19, 2013

This is the most stable configuration of an electric dipole in a uniform electric field. The length of the dipole makes 00 with the electric field.

The potential energy of the dipole at this position is,

U = -p.E = -pE cos0 = -pE

Which is the minimum potential energy of an electric dipole.

The potential energy of the dipole at this position is,

U = p.E = pE cos0 = pE

Which is the maximum potential energy of an electric dipole.

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