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Explain why, a freely suspended magnet always points in the north-south direction.
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.
What is a natural magnet? State two limitations of a natural magnet.
Explain what you understand by magnetic induction. What role does it play in attraction of a piece of iron by a magnet?
State four properties of magnetic field lines.
Sketch four magnetic field lines as obtained in a limited space on a horizontal plane in the earth's magnetic field alone.
Draw magnetic field lines produced around a current-carrying straight conductor passing through cardboard. Name, state and apply the rule to mark the direction of these field lines.
Which substances are used for making electromagnets?
Select the correct option:
The magnetic strength of a bar magnet is:
Complete the following diagram of magnets to show the lines of force.
