Question

A current loop placed in a magnetic field behaves like a
A) Magnetic dipole
B) Magnetic substance
C) Magnetic pole
D) Non-magnetic substance

Answer 1

Hint: Here we can draw a diagram to understand the setup and see the behaviour of the current loop. Current loop is basically a coil whose ends are connected to each other and a current is flowing through this loop. Magnetic fields are produced due to moving charges or we can say current.

Complete step-by-step answer:
Diagram for the given question can be drawn as shown below

Here we can see that when a current loop is placed in a magnetic field, magnetic field will pass through it, the lower portion or if we see the loop from below then it will act as the south pole of magnetic and the upper portion or if we see from above then the current loop will acts as north pole as magnetic field lines goes from south to north.
Now same as electric dipole, magnets as have dipoles (north and south), magnetic monopoles will not exist. Therefore we can say that the current loop will behave like a magnetic dipole having North Pole and South Pole where the lower portion will be South Pole and upper portion of the loop will be North Pole.

So, the correct answer is “Option A”.

Note: As magnets exist in dipole, therefore it will have magnetic moment and torque associated with it. Magnetic dipole is similar to the electric dipole which has opposite charges but an electric monopole can exist but magnetic monopole doesn’t because magnetic field lines are in closed loops and therefore it can’t have monopole.