Question

Choose the correct statement(s) from the following

• A. Magnetic lines of force appear to converge or diverge at poles
• B. Magnetic lines of force never intersect each other
• C. On passing AC through a wire wound around a magnet its strength of magnetism enhances
• D. A magnet attracts certain other substances through the phenomenon of magnetic induction

Answer 1

Answer: (A), (B), (D)

The correct options are
A Magnetic lines of force appear to converge or diverge at poles
B Magnetic lines of force never intersect each other
D A magnet attracts certain other substances through the phenomenon of magnetic induction

Magnetic lines of force are the imaginary lines of a magnetic field, along which a north pole will move if kept over there.

We know that a north pole repels another one and attracts a south one. Hence the lines of force appear to originate and diverge from a north pole, and appear to converge and end at a south pole.

If the lines would intersect, then at the junction point, there will be two paths along which a north pole will simultaenously move. Since this is not possible, they never intersect.

An Alternating Current A.C. is the one in which the direction of the current constantly reverses and again becomes like before repeatedly. If we try to strengthen a magnet with a coil, an AC won't work. This is because the polarity of the field generated by the coil will constantly keep changing. It will neither strengthen nor weaken the magnet.

Certain magnetic substances like iron, nickel, cobalt etc, when placed near a magnet, their particles get arranged in such a way that the substance becomes a magnet. The side of the substance which is close to a pole of the original magnet, becomes a pole of the opposite type. The substance then tries to stick to the magnet. This phenomenon is called as magnetic induction.