Page 151 - Physics Form 5 KSSM_Neat

Discussion: CHAPTER 4
1. What is the relationship between the voltage applied across the copper wire and the current
in the wire?
2. How does the magnitude of the current affect the magnitude of the force acting on the Electromagnetism
current-carrying conductor?
3. What is the effect of the strength of the magnetic field on the magnitude of the force acting
KEMENTERIAN PENDIDIKAN MALAYSIA
on the current-carrying conductor?
From Activity 4.3, it is found that the magnitude of the force
acting on the current-carrying conductor in a magnetic field Brain-Teaser
increases when the magnitude of the current and the strength of the
magnetic field increases. The effect of the increase in current and How can the strength of the
magnetic field and the current
the strength of magnetic field on the force can be observed from be increased?
the height of swing of the copper frame as shown in Figure 4.6.

Current, I Current, I Current, I
1 2 2
Larger force Larger force
and higher and higher
swing swing

N N
N

S S S

Magnetic poles are closer to each
Current I > I other, stronger magnetic field and
2
Larger force 1
larger force
Figure 4.6 Effects of current and magnetic field on force

Current
Figure 4.7 shows another
way to study the factors that affect
the magnitude of the force acting Track Current
on a current-carrying conductor S
in a magnetic field. The distance
travelled, d, by the conductor
represents the magnitude of the
force. The larger the force, the N d Track without
further the distance travelled by insulation
the conductor. Original position of conductor

Figure 4.7 Distance travelled, d, by a conductor when electric current
flows through it

LS 4.1.3 141