Is it true that the single-touch method of making magnets is extensively used nowadays?

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True

False

answer is B.

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Detailed Solution

The above statement is false.
Single touch method:
The rubbing of an iron bar with a magnet repeatedly is called magnetization of an iron bar by the single-touch method. This method is the simplest and most convenient method to make a small magnet that does not require a large magnetic field of attraction. The only thing you need is a ferromagnetic object and a permanent magnet.
Electrical method:
A ferromagnetic material is placed inside a solenoid, and a direct current is passed into a solenoid (along insulated wire coiled into a cylinder). It produces a strong magnetic field inside the coil, which is uniform in strength and direction. For example, a steel bar placed inside the current-carrying coil or solenoid for a short period of time becomes magnetized due to magnetic induction from the solenoid. Magnetization by electrical method produces more powerful magnets than other magnetization methods.
The correct statement would be that the electrical method is the most effective magnetization method because it is much quicker than the other methods and produces strong magnets.

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