Question

A coil carrying a heavy current and having large
number of turns is mounted in a N-S vertical
plane. A current flows in the clockwise direction.
A small magnetic needle at its centre will have its
north pole in
(a) east-north direction
(b) west-north direction
(c) east-south direction
(d) west-south direction

Answer 1

Answer:

might be option b or option c

Answer 2

Answer:

A small magnetic needle at its centre will have its  north pole in West North Direction

Explanation:

When the plane of coil is in N-S vertical plane and current is passed in clockwise direction, the magnetic field at the center of coil due to current is directed East to West.

This magnetic field is given as

[tex]B = \frac{\mu_o i}{2R}

Also at the same position Earth's magnetic field is south to North.

Since the magnetic needle will be in the direction of resultant magnetic field,

So here the net magnetic field is the vector sum of magnetic field due to coil and magnetic field of Earth

which will be in the west-north direction.

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Topic : magnetic field due to current loop

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