DULWICH COLLEGE SHANGHAI
71+U1
()+.W
K!L M+N C L+/#)0%"+$%+%3#1$1)%81.12+,-29%%!"1%-',&',%L2-/%,"1%81.12+,-2%#$%A;< _+9*9%%!"10
+)$-%"+U1%+%,2+.$L-2/12%4"#*"%4#))%213'*1%,"1%U-),+81%L2-/%,"1%81.12+,-2%,-%B _+9*9
M#N D"+,%3-%,"1%)1,,12$%+9*9%$,+.3%L-2`
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999
MKN
M##N g1$*2#(1%+9*9
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999
MKN
M(N M#N S+)*')+,1%,"1%U+)'1%-L%,"1%-',&',%*'221.,V%#.%+/&$V%4"1.%,"1%#.&',%*'221.,%,-%,"1
,2+.$L-2/12%#$%A9= C9
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999
999999999999999999999999999999999999999999999999999
S'221.,%^%99999999999999999999999999%C
M"N
M##N D"+,%+$$'/&,#-.%"+U1%0-'%/+31`
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999
MKN
OK!
M='0-?*S*.-<Q1N
!"#$$%$&'$+#(!
IGCSE ELECTROMAGNETISM PRACTICE QUESTIONS
AI
=A<(*'F;<
PAGE 1
DULWICH COLLEGE SHANGHAI
71+U1
()+.W
KPL !"1%3#+82+/%$"-4$%&+2,%-L%+%$#/&)1%1)1*,2#*%/-,-29
+6#$
/+8.1,
/+8.1,
*-#)
!"1%/-,-2%#$%*-..1*,13%,-%+%39*9%&-412%$'&&)09
M+N C $,'31.,% &213#*,$% ,"+,V% 4"1.% ,"1% /-,-2% #$% $4#,*"13% -.V% ,"1% *-#)% 4#))% ,'2.% #.% +
*)-*W4#$1%3#21*,#-.9
M#N @+/1%,"1%2')1%4"#*"%,"1%$,'31.,%*-')3%'$1%,-%/+W1%,"#$%&213#*,#-.9
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999
MKN
M##N 56&)+#.%"-4%,"1%2')1%$"-4$%,"+,%,"1%*-#)%4#))%,'2.%#.%+%*)-*W4#$1%3#21*,#-.9
]-'%/+0%+33%,-%,"1%3#+82+/%-2%32+4%+.-,"12%3#+82+/%,-%"1)&%0-'%16&)+#.9
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999
M"N
M###N Y'881$,%-.1%*"+.81%4"#*"%4-')3%/+W1%,"1%*-#)%,'2.%L+$,129
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999
MKN
M#UN Y'881$,%-.1%*"+.81%4"#*"%4-')3%/+W1%,"1%*-#)%,'2.%#.%,"1%-&&-$#,1%3#21*,#-.9
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999
MKN
;<
!"#$$%$&'#'#(!
IGCSE ELECTROMAGNETISM PRACTICE QUESTIONS
PAGE 2
DULWICH COLLEGE SHANGHAI
Leave
blank
5.
(a) A student has a dynamo on her bicycle. When the front wheel turns, a magnet rotates
within coils of wire and a lamp on the bicycle lights up.
rotating
magnet
coils of wire
coils of wire
Explain how the rotation of the magnet causes the lamp to light.
.......................................................................................................................................
.......................................................................................................................................
.......................................................................................................................................
(3)
(b) State one way in which the brightness of the lamp could be increased.
.......................................................................................................................................
(1)
Q5
(Total 4 marks)
*N26259A0728*
IGCSE ELECTROMAGNETISM PRACTICE QUESTIONS
7
Turn over
PAGE 3
DULWICH COLLEGE SHANGHAI
Leave
blank
17. (a) Complete the sentence.
A current in a conductor produces a .............................................................................
around the conductor.
(1)
(b) The diagram shows a current-carrying wire in a magnetic field.
wire
positive
north
south
negative
The wire is free to move.
A student correctly predicts that when the current is switched on the wire will move
out of the page.
Name the rule the student used to make her prediction and explain how she used the
rule.
You may draw a diagram to help to explain your answer.
.......................................................................................................................................
.......................................................................................................................................
.......................................................................................................................................
.......................................................................................................................................
(3)
28
*N34027A02836*
IGCSE ELECTROMAGNETISM PRACTICE QUESTIONS
PAGE 4
DULWICH COLLEGE SHANGHAI
Leave
blank
(c) Give one way to increase the electromagnetic force on a wire in a magnetic field.
.......................................................................................................................................
.......................................................................................................................................
(1)
(d) A device uses the changing electromagnetic force on a coil of wire in a magnetic field
to make a cone vibrate.
Name this device.
.......................................................................................................................................
(1)
Q17
(Total 6 marks)
*N34027A02936*
IGCSE ELECTROMAGNETISM PRACTICE QUESTIONS
29
Turn over
PAGE 5
DULWICH COLLEGE SHANGHAI
Leave
blank
5.
A class uses a step-up transformer in a model transmission line.
The transformer is shown below.
The input voltage is 6 Va.c. and there are 20 primary turns.
INPUT
OUTPUT
6 Va.c.
20 turns of wire
primary
secondary
(a) The output voltage is 24 Va.c. How many secondary turns does the transformer
have?
.......................................................................................................................................
.......................................................................................................................................
Number of turns = ............................
(2)
(b) State how this transformer could be used as a step-down transformer.
.......................................................................................................................................
.......................................................................................................................................
(1)
(c) A student wants to use an input voltage of 60 Va.c. Why does the teacher tell him
that this is not a good idea?
.......................................................................................................................................
.......................................................................................................................................
(1)
(d) A step-up transformer is used just outside a power station to increase the voltage.
State why the voltage is increased.
.......................................................................................................................................
.......................................................................................................................................
(1)
Q5
(Total 5 marks)
*N34027A0936*
IGCSE ELECTROMAGNETISM PRACTICE QUESTIONS
9
Turn over
PAGE 6
DULWICH COLLEGE SHANGHAI
10. An electromagnetic force usually acts on a wire which carries a current in a magnetic
field.
(a) Name two devices which use this effect.
1 ....................................................................................................................................
2 ....................................................................................................................................
(2)
(b) State two ways in which the force acting on the wire can be increased.
1 ....................................................................................................................................
.......................................................................................................................................
2 ....................................................................................................................................
.......................................................................................................................................
(2)
(c) Professor J A Fleming invented a rule to remember the directions involved in this
effect. This rule is known as Fleming’s left-hand rule.
The diagram shows a left hand with two fingers and the thumb extended.
Draw a straight line from each of them to the correct box for this rule.
direction of magnetic field
from north to south
direction of magnetic field
from south to north
direction of current from
negative to positive
direction of current from
positive to negative
direction of force
(3)
20
*N34944A02036*
IGCSE ELECTROMAGNETISM PRACTICE QUESTIONS
PAGE 7
Leave
blank
DULWICH COLLEGE SHANGHAI
Leave
blank
(d) Sometimes a wire carries a current in a magnetic field but no electromagnetic force
acts on it.
Explain how this can happen.
.......................................................................................................................................
.......................................................................................................................................
(1)
Q10
(Total 8 marks)
*N34944A02136*
IGCSE ELECTROMAGNETISM PRACTICE QUESTIONS
PAGE 8
21
Turn over