Question

A magnetic needle kept nonparallel to the magnetic field in a nonuniform magnetic field experiences... *

1) a force but not a torque

2) a torque but not a force

3) both a force and a torque

4) neither force nor a torque

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Answer 1

ÁñẞwÉr

•Magnetic needle can be considered as a magnetic dipole since it is placed in a non uniform magnetic field it will experience af force as magnetic force on both magnetic force will be different. Also, needle is placed non parallel to the field, so it will experience a torque also.

•Therefore, C is correct option.

@itzẞparkly!♥️

Answer 2

Answer:

The magnetic needle kept nonparallel to the magnetic field in a

non-uniform magnetic field experiences both force and  torque i.e.option(3)

Explanation:

Force

The force on the magnet is given as,

$F=I(L\times B)=BILsin\theta$         (1)

where,

F=magnetic force acting on the needle

B=magnetic field in which the needle is present

I=current flowing in the needle

L=length of the needle

As stated in the question needle kept nonparallel to the non-uniform magnetic field which means the value of θ is not zero it is other than zero. As zero is possible only in case of if it is kept parallel to the magnetic field. So, the force will not be zero.

Torque

The torque is given as,

$\tau=M\times B=MBsin\theta$           (2)

Where,

τ=torque

M=magnetic moment

B=magnetic field

here also the case will be the same as the force on the magnet.

Hence, a magnetic needle kept nonparallel to the magnetic field in non-uniform magnetic field experiences both  force and  torque i.e.option(3)