Page 149 - Physics Form 5 KSSM_Neat

The direction of the force on a current-carrying conductor can be determined by using CHAPTER 4
Fleming's left-hand rule as shown in Figure 4.4.

Fleming's left-hand rule Electromagnetism

KEMENTERIAN PENDIDIKAN MALAYSIA
Step
Force 1 Index finger shows the direction
of the magnetic field, that is, from
north to south.

Magnetic
field
Step
2 Middle finger shows the direction

of the electric current.

Current Step
3 The thumb will show the
direction of the force acting on
the conductor. The direction of
motion of the conductor follows
the direction of the force.

Current Force
S

N

Magnetic field
from N to S Current

Figure 4.4 Fleming's left-hand rule to determine the direction of the force

Factors Affecting the Magnitude of the Force Acting on a Current-carrying
Conductor in a Magnetic Field
A large force is required to drive the motor in a washing machine compared to the cooling fan in
a notebook computer which requires a smaller force. What are the factors affecting the magnitude
of the force acting on a current-carrying conductor in a magnetic field?

LS 4.1.2 139