Page 262 - Physics Form 5 KSSM_Neat

(c) Figure (a): Direction of motion of magnet to
the left
Figure (b): Direction of motion of magnet to
Summative Practice
the right
1. – The filament lamps require high resistance to (d) Increase the number turns of the solenoid
produce light. Increase the speed of motion of the magnet
– The coiled filament causes the wire length to
increase. 4. I = 7.2 A
KEMENTERIAN PENDIDIKAN MALAYSIA
S
– The resistance is directly proportional to the The loss of energy from the transformer can be
length of the wire. neglected, that is the transformer is ideal.
– The longer the filament wire, the higher the 7. (a) 2.5 A
resistance.
– The higher the resistance, the brighter the lamp. (b) The transformer is ideal
8. 60.00 %
2. (a) (i) 4.5 Ω
– Use laminated soft iron core
(ii) 1.33 A
(iii) 3.99 V – The secondary coil is wound on top of the
primary coil
(b) Bulb X is the brightest compared to bulb Y
and bulb Z. Bulb Y and bulb Z have the same
brightness.
(c) (i) 6 Ω
(ii) 1.0 A Summative Practice
(iii) 3 V
1. (a)
(d) Bulb X and bulb Y glow with equal brightness.
Bulb Z does not light up.
3. (a) The electromotive force, e.m.f. is the energy
transferred or work done by a source of
electrical energy to move one coulomb of
charge in a complete circuit.

(b) The bulb does not light up because the diode is
in reverse biased state.
Summative Practice
2. (a)
2. Fore finger: Direction of magnetic field
Middle finger: Direction of current
Thumb: Direction of force
Force/ Motion
(b)

Magnetic
field

3. (a)
Current

D D
4 1
Key:
Positive cycle
3. (a) Induced current is the current produced in Negative cycle
a conductor when there is relative motion
between the conductor and a magnet that causes D D
the conductor to cut magnetic field lines. 2 3
(b) X: north pole
Y: south pole (c) Half-wave rectification will occur
252