Page 152 - Physics Form 5 KSSM_Neat

Effect of a Current-carrying Coil in a Magnetic Field
Figure 4.8 shows a rectangular coil formed with a piece of copper wire. When the coil is connected
to a power supply, current can flow through the coil in the direction of A ˜ B ˜ C ˜ D or D ˜
C ˜ B ˜ A. What is the effect on the coil if the coil carries a current in a magnetic field?

A B C D
KEMENTERIAN PENDIDIKAN MALAYSIA

A B

D C
Figure 4.8 A rectangular coil formed with a copper wire

Activity 4.4 ISS ICS

Aim: To observe the turning effect on a current-carrying coil in a magnetic field
Instructions:
1. Carry out this activity in pairs.
SCAN ME
2. Scan the given QR code to watch a video on the turning SCAN ME
effect on a current-carrying coil in a magnetic field. Video of turning
3. Download Figure 4.9 from the given website and complete effect on a
the diagram by: current-carrying
coil
(a) labelling the direction of the current in sections AB, BC
and CD http://bit.ly/2YwcXXr
(b) labelling the direction of the force on the coil at sections
AB and CD
SCAN ME
(c) mark the direction of rotation of the coil SCAN ME
Worksheet
B C (Figure 4.9)

D N
S http://bit.ly/3gqdyAa
A

–
+

Figure 4.9

The current-carrying coil in a magnetic field will rotate about the axis of rotation. This d
rotation is due to a pair of forces of equal magnitude but in opposite directions acting on the sides
of the coil. This pair of forces is produced by the interaction between the current-carrying coil and
the magnetic field from the permanent magnet.
142 LS 4.1.3 4.1.4