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An electret is similar to a magnet, but rather than being permanently magnetized, it has a permanent electric dipole moment. Suppose a small electret with electric dipole moment 1.0×10-7Cm is 25cmfrom a small ball charged to +25nC, with the ball on the axis of the electric dipole. What is the magnitude of the electric force on the ball?

Short Answer

Expert verified

The electric force on the ball is9.216×10-3N.

Step by step solution

01

Given information

Given the electric dipole of charge 25nCwith a dipole moment of 10-7Cmseparated b distance25cm.

02

Explanation

Electric field due to a dipole:

E=2p4πε0r3E=9×109×2×1×10-7253×10-6E=1.152×105N/C

The electric force on the ball:

E=FqF=EqF=1.152×105N/C1.0×10-7CmF=9.216×10-3N

The electric force on the ball is9.216×10-3N

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