1.

(a)Whatis an electromagent? Draw a circuitdiagram to showhow a soft iron piece can betransformed into an electromagnet ? (b) Statetwo waysby whichthe strenghtof an electromagnetcan be increased.

Answer»

Solution :(a) An electromagentis a ROD of magnetic(say soft iron) placedinsidea solenoidcoil . On passingcurrentin solenoidcoil , ion rodbegins to BEHAVE as a magnet. Onstoppingthe CURRENTFLOW, magnetisationof iron is lost . Thus , a soft iron piece behaveas an electromagnet .
(b) Thestrenghtofan electromagnetcan beinscreased by .
(i) increasingthe amountof turnsofwinding ofthe solenoid coil wrapped around theelectromagnetor .
(ii)increasingthe amountof electric CURRENT flowingthrough the coil.


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