8A7m - Aruhan electromagnet dan Hukum Faraday

4.  Diagram 4.1 show a magnet which is dropped through a coil connected to a galvanometer and diagram 4.2 shows the movement when the magnet is leaving the coil.

Rajah 4.1 menunjukkan suatu magnet dijatuhkan melalui solenoid yang disambungkan kepada galvanometer sementara rajah 4.2 menunjukkan pergerakan magnet itu setelah melalui lingkaran solenoid itu.

(a) Named the process that produce the current ?

Namakan proses yang menghasilkan arus tersebut ?

…………………………………………………………………………………………………….

[1 mark / 1 markah]

(b) (i) Compare the magnitude of current in both diagram .

Bandingkan magnitud arus pada kedua-dua rajah.

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[1 mark / 1 markah]

(ii) Explain your answer.

Jelaskan jawapan anda.

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[1 mark / 1 markah]

(c) (i) Explain how the current in Diagram 4.1 is produced .

Terangkan bagaimana arus di Rajah 4.1 dihasilkan .

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[1 mark / 1 markah]

(ii) Name the law that is applied in 5(c)(i).

Namakan hukum yang digunakan di 5(c)(i).

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[1 mark / 1 markah]

(d) In Diagram 4.1 ,the arrows show the direction of flow of the induced current at the instant the bar magnet enter the coil.Explain how this opposes the entry of the magnet.

Pada rajah 4.1 , anak panah menunjukkan arah pengaliran arus teraruh ketika batang magnet memasuki gegelung itu.Terangkan bagaimana arus ini menentang kemasukkan magnet itu .

…………………………………………………………………………………………

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[2marks /2 markah]

 Jawapan :

4.	a	Electromagnetic induction	1
	b(i)	Magnitud of current in  diagram 4.2 is higher than diagram 4.1	1
	(ii)	Velocity is higher in diagram 4.2	1
	c(i)	When the magnet is entering the coil, a change in magnetic flux occurs	1
	(ii)	Faraday’s law	1
	d	-According to Lenz’s law, the current induced in the top end of the solenoid will flow in a direction that opposes the movement of the magnet into the solenoid -Thus the induced current flows in an anticlockwise direction to produce the north pole which is the same pole as the magnet so that it repels its approached	1 1
TOTAL			7