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  4. A wire PQRS carrying a current I runs along three edges of a cube of side l as shown. There exists a uniform magnetic field of magnitude B along one of the sides of the cube. The magnitude of the force acting on the wire is <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/physics/440b8102254d6e0d9ea55ab9d4d24f52-.png />

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Q. A wire PQRS carrying a current I runs along three edges of a cube of side $l$ as shown. There exists a uniform magnetic field of magnitude $B$ along one of the sides of the cube. The magnitude of the force acting on the wire is
image

Moving Charges and Magnetism

Solution:

Force on the part of wire which is parallel to $\vec{ B }$ will be zero. The forces on the other two parts will each be $I l B$ in perpendicular directions.