Physics Annual Examinations For Secondary Schools Form 5 - Directorate For Quality And Standards In Education, 2013 Page 6
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12Section B.
This section has 5 questions. Each question carries 20 marks (100 marks).
8.
This question is about the motor effect of an electric current.
+
-
The figure represents a circuit connected to a metal swing ABCD.
•
•
This metal swing can move freely.
loops
a.
Draw an arrow on wire BC to show the direction of current
when the switch is closed.
(1)
D
b.
Draw magnetic field lines between the poles of the magnet.
A
(2)
c.
i.
State what happens around the wire in the circuit when
S
the switch is closed.
B
C
______________________________________________________
(1)
N
ii.
Underline the instrument that can be used to test the
presence of the answer you mentioned in c ( i )?
( voltmeter, plotting compass, ammeter, stopwatch )
(1)
d.
When the switch is closed, wire BC experiences a force.
i.
Underline the correct answer:
This force acts ( out of the page towards you / inside the page, away from you )
(2)
ii.
Which rule did you use to find the answer in d ( i ) ?
________________________________________________________________________________
(2)
iii.
State two ways to increase the size of this force.
________________________________________________________________________________
(2)
e.
Richard varies the current flowing in the circuit and records the size of the force as shown in
the table below.
Force F / N
0
0.5
1.0
1.5
2.0
Current I / A
0
0.2
0.4
0.6
0.8
i.
Plot a graph of the force F (y-axis) against the current I (x-axis).
(5)
ii.
From the graph it can be concluded that the Force and Current are ______________
proportional.
(2)
iii.
Use your graph to find the value of the current that produces a force of 2.5 N.
________________________________________________________________________________
(2)
Physics – Secondary Schools – Track 2 - Form 5 – 2013
Page 6 of 12
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