How does a current loop behave like a ba...

How does a current loop behave like a bar magnet?

Text Solution

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A current loop behaves as a bar magnet because (i) one face of current loop behaves as a south pole and the other face as north pole.
(ii) it possesses a magnetic dipole moment `(M=IA)` and
(iii) it experiences a torque in an external magnetic field, which tends to align the axis of the loop along the direction of magnetic field as bar magnet does.

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Assertion: A closed current carrying loop behaves like a magnetic dipole. Reason: Force and torque on the loop is zero as shown in figure.

If both the assertion and reason are true and reason is a true explantion of the assertion.

If both the assertion and reason are true but the reason is not true the correct explantion of the assertion.

If the assertion is true but reason false

If both the assertion and reason are false.

A current carrying small loop behaves like a small magnet. If A be its area and M its magnetic moment, the current in the loop will be

`M//A`

`A//M`

`MA`

`A^(2)M`

A gas is said to behave like an ideal gas when the relation PV/T = constant. When does a real gas not behave like an ideal gas?

When the temperature is low

When both the temperature and pressure are low

When the temperature is high and pressure is low