JEE Main · 2005 · 08 May 2005 · Offline · Magnetic Properties of Matter

A magnetic needle is kept in a non-uniform magnetic field. It experiences

(A)a torque but not a force
(B)neither a force nor a torque
(C)a force and a torque.✓ Correct
(D)a force but not a torque.

Answer: (C)

Solution

In a uniform field a magnetic needle feels only a torque, because the forces on its two poles are equal and opposite and cancel. In a non-uniform field those pole forces no longer cancel, so the needle experiences a net force as well as the aligning torque; it feels both a force and a torque.

JEE Main · 2005 · 08 May 2005 · Offline · Single correct option

Practise more: all JEE Main PYQs on Magnetic Properties of Matter →

More JEE Main questions on Magnetic Properties of Matter

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Consider a ferromagnetic material :
Assertion (A) : The individual atoms in a ferromagnetic material possess a magnetic dipole moment and interact with one another in such a …
JEE Main 2026View solution →
A short bar magnet placed with its axis at $3 0^{\circ}$ with an external field of 800 Gauss, experiences a torque of 0.016 N.m. The work done in moving it from most stable to most unstable position is $α \times 1 0^{- 3} J$ . The value of $α$ is ______.
JEE Main 2026View solution →
A solenoid has a core made of material with relative permeability 400. The magnetic field produced in the interior of solenoid is 1.0 T. The magnetic intensity is SI units is $α \times 1 0^{5}$ . The value of $α$ is ______. (Free space permeability …
JEE Main 2026View solution →
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason(R).
Assertion (A) : Magnetic monopoles do not exist.
Reason (R) : Magnetic field lines are continuous and form closed loops.
In the light of the above statements, choose the most …
JEE Main 2025View solution →
The percentage increase in magnetic field (B) when space within a current carrying solenoid is filled with magnesium (magnetic susceptibility $χ_{m g} = 1.2 \times 1 0^{- 5}$ ) is:
JEE Main 2025View solution →
Match List-I with List-II:
List-I: (A) Magnetic induction (B) Magnetic intensity (C) Magnetic flux (D) Magnetic moment
List-II: (I) Ampere meter² (II) Weber (III) Gauss (IV) Ampere/meter
Choose the correct answer from the options given below:
JEE Main 2025View solution →