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Figure shows an equilateral triangle ABC...

Figure shows an equilateral triangle ABC of side l carrying currents as shown, and placed in a uniform magnetic field B perpendicular to the plane of triangle. The magnitude of magnetic force on the triangle is

A

`ilB`

B

`2 ilB`

C

`3ilB`

D

zero

Text Solution

Verified by Experts

The correct Answer is:
A
The equivalent figure can be redrawn as shown.

Force on `AB=ilB`,
Force on `BCA=2ilB` in opposite
direction to that on `BA`.
Hence net force `=2ilB-ilB=ilB`
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