How does a magnetic compass needle behave in a magnetic field?

It assures a position right angle to magnetic field

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It assures a position which follows a line of magnetic field

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It starts rotating

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none of these

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Solution

The correct option is B It assures a position which follows a line of magnetic field
A compass points north because all magnets have two poles , a north pole and a south pole, and the north pole of one magnet is attracted to the south pole of another magnet.
The Earth is a magnet that can interact with other magnets in this way, so the north end of a compass magnet is drawn to align with the Earth's magnetic field. Because the Earth's magnetic North Pole attracts the "north" ends of other magnets, it is technically the "South Pole" of our planet's magnetic field.
Option B

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A pivoted magnetic compass needle is free to rotate in a horizontal plane in earth's magnetic field. Another magnetic field of induction $0.54 \times 10^{- 4}$ Tesla is applied at right angles to the earth's field $B_{H} = 0.36 \times 10^{- 4}$ Tesla. The angle through which the needle deflects is:

Q. A magnetic needle is placed in a uniform magnetic field and is aligned with the field. The needle is now rotated by an angle of

60^{\circ}

and the work done is W. The torque on the magnetic needle at this position is:

Q. Which of the following statements is incorrect regarding magnetic field lines?

(a) The direction of magnetic field at a point is taken to be the direction in which the north pole a magnetic compass needle points.
(b) Magnetic field lines are closed curves.
(c) If magnetic field lines are parallel and equidistant, they represent zero field strength.
(d) Relative strength of magnetic field is shown by the degree of closeness of the field lines.

A magnetic needle is placed in a uniform magnetic field and is aligned with the field. The needle is now rotated by an angle of $60^{\circ}$ and the work is W. The torque on the magnetic needle at this position is:

Which of the following statement concerning magnetic field is correct?

(1) The part of a bar magnet, at which the magnetic field is the strongest, is called its pole.

(2) A magnetic field is never created by a compass needle.

(3) Magnetic lines of forces can intersect each other.

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