topical electromagnet

8/11/2019 Topical Electromagnet

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. Diagarm 2.1 shows a simple electomagnet

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(ii) Type of core.....................................................................................

Reason............................................................................................[2 marks

(iii) !"m#er of t"rns...............................................................................

Reason ............................................................................................ [2 marks

(c)$ase% on yo"r answers in &(#)'%etermine the most s"ita#le crane in Ta#le & to lift iron scrap in a factory.

..........................................................................................................[1 mark(%) $ase on yo"r choice in &(c)'state the change in the "antity of the iron scrap that can #e life% when the cylin%rical soft

core is replace% with a *+shape% iron core. ,-plain yo"r answer

................................................................................................... [2 marks

(e) A crane is "se% to lift 250 kg of iron scrap to a height of 4m in 5 s. Determine the o"tp"t power of the crane .

[2 marks

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. Diagram 3 shows a bar magnet is pushed into solenoids P and the same bar magnet is puaway from solenoid Q at the same speed. In both situations the galvanometer is deected.

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(a) !ame the phenomenon showe% on Diagram 30

1 m

(#) n Diagram 3.1 mark with arrows the %irection of c"rrent flows in the solenoi%s an% the %eflection ofpointer in the galanometer in olenoi% . 3 ma

(c) (i) tate the name gien to the c"rrent that flows in the circ"it0

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(ii) ,-plain what ca"ses the c"rrent flows in the circ"it.

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) tate a mo%ification re"ire% to ena#le the motor to #e "se% with alternating c"rrent. tate yo"r reason.

i) Twoways to increase the spee% of ratation of the motor

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b) Using diagram 6.1 and Diagram 6.2

(i) the number of turns of the solenoid

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topical electromagnet

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