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## Class 12 Physics (India)

### Unit 4: Lesson 12

Current loops as magnetic dipoles

# Magnetic dipoles & dipole moment

A tiny current loop act's as a tiny magnet technically called a magnetic dipole. The strength of that tiny magnet, the magnetic dipole moment m, is given by m = NIA, giving the units - Ampere meter square. The magnetic dipole moment is a vector quantity and its direction is given by the right-hand thumb rule. Magnetic dipoles are different than electric dipoles in that, there are no magnetic monopoles, only dipoles. Created by Mahesh Shenoy.

## Want to join the conversation?

• what exactly does A mean here? in m = nIA ?
(1 vote)
• What is the difference between M=NIA and M=n(2l)?Are they the same quantity?
(1 vote)
• Technically, yes, they're the same thing. Here 'N' is the no. of loops, whereas 'n' is the loop per unit length (N/l). So multiplying it (n) with the total length 'l', we get 'N' again, i.e. the number of loops
(1 vote)