First slide

Force on a current carrying wire placed in a magnetic field

Question

A wire PQR is bent as shown in figure and is placed in a region of uniform magnetic field B. The length of PQ = QR = l. A current I ampere flows through the wire as shown. The magnitude of the force on PQ and QR will be

Easy

A

BIl, 0
B

2BIl, 0
C

0, BIl
D

0 , 0

Solution

PQ experience no force as $\vec{B}$ is parallel to l
QR experience a force = ilB
Here $\vec{B}$ is perpendicular to l.

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