Q24 of 72 Page 13

State the composition of the alloy called nipermag? Give an important use of this alloy.

Nipermag is an alloy of iron, nickel, aluminium and titanium. Permanent magnet of this alloy is more stronger than those made of ordinary steel. Hence it used in microphones and loudspeakers.

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22 What type of core should be put inside a current-carrying solenoid to make an electromagnet? 23 Distinguish between a bar magnet and an electromagnet. 25 Derive the formula for the force acting on a charged particle moving in a magnetic field. 26 How does alternating current differ from the direct current?