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

Question

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" /> (A) 0 (B) I l B (C) √2 IlB (D) 2 I l B

Tardigrade Admin · Accepted Answer

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.

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

0

$I lB$

$2 I lB$

$2 I lB$

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

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

0

IlB

2​IlB

2IlB

Force on the part of wire which is parallel to B will be zero. The forces on the other two parts will each be IlB in perpendicular directions.

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

$I lB$

$2 I lB$

$2 I lB$

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