(b) A magnetised needle in a uniform magnetic field experiences a torque but not net force. An iron nail near a bar magnet, however, experiences a force of attraction in addition to a torque. Why?

(a) What happens if a bar magnet is cut into two pieces (i) transverse to its length (ii) along its length? (b) What happens if an iron bar magnet is melted? Does it retain its magnetism? (c) A magnetised needle in a uniform magnetic field experiences a torque but no net force. However, an iron nail near a bar magnet experiences a force of attration in addition to a torque, explain. (d) Must every magnetic field configuration have a north pole and a south pole? What about the field due to a toroid? (e) Can you think of magnetic field configuration with three poles? (f) Two identical looking iron bars A and B are given, one of which is definitely known to be magnetised. How would one ascertain whether or not both are magnetised? If only one is magnetised how does one ascertain which one? Use nothing else but the bars A and B.

An iron nail near a bar magnet experiences

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

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

A current carrying loop in a uniform magnetic field will experience

A charged particle moving in a magnetic field experiences a resultant force

Torque acting on a current loop in a uniform magnetic field is equal to

Assertion (A): A magnetic suspended freely in an uniform magnetic field experiences no net force, but a torque that tends to align the magnet along the field when it is deflected form equilibrium position Reason (R ): Net force mB-mB=0 , but the forces on north and south poles being equal, unlike and parallel make up a couple that tends to align the magnet, along the field.

Will a current loop placed in a magnetic field always experience a zero force?

If plane of coil and uniform magnetic field B(4T0 is same then torque on the current carrying coil is