12th Physics notes | Electric Dipole

12th Physics notes | Electric Dipole | CBSE NCERT Solutions

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Question: What happens when an electric dipole is placed in a non-uniform electric field?

Ans: When an electric dipole is placed in a non-uniform electric field, the dipole will have both rotational and translational motion. When the dipole becomes parallel to the electric field, the rotational motion will stop.

Question: An electric dipole consists of a positive and negative charge of 4µC each placed at a distance of 5mm.Calculate dipole moment.

Ans:

q = ±4µC = ±4 × 10-6C

p = q x 2a

2a = 5mm = 5 × 10-3 m

= 4 × 10-6 × 5 × 10-3

= 2 × 10-8 C- m

Download previous year question paper of CBSE class 12 physics

Electric Dipole: A system containing two equal and opposite charges separated by a finite distance is called an electric dipole.

Electric Dipole moment: Electric dipole moment is defined as the product of magnitude of one of the charges and length of the dipole say ‘2a’ i.e.

The electric dipole moment is a vector quantity.
It is directed from – q to + q i.e.from negative charge to the positive charge.
SI unit of electric dipole moment isCoulomb- meter (Cm).
The net charge on an electric dipole is zero.

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