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1. In the following experiments, induction moves the needle of a
sensitive
meter.
Fig. 1 Fig. 2
(a) In Fig. 1, without changing the equipment, how can you move
the needle more?
________________________________________________________________________[1
(!) In Fig. 2, how can you ma"e the needle move !ac" and #orth
$everal time$?
2. % coil o# wire i$ connected to a $en$itive galvanometer a$
$hown in the
diagram.
(a) &hat i$ o!$erved when the magnet i$ moved toward$ the
coil?
(!) 'plain why thi$ occur$.
3. The diagram shows an electromagnetic device.
(a) ame thi$ device.
_____________________________________
[1
(!) *tate the name$ o# the part$ la!elled.
(i) ________________________________
(ii) ________________________________
(iii) ________________________________ [+
(c) ame the in$trument you would attach to the output o# the
device to o!tain a trace o# the voltage
produced.
________________________________________________________________________[1
(d) *"etch a graph o# the voltage produced again$t time when the
coil i$ rotated - time$ per $econd.
1
SCIENCE DEPARTMENTTHE ENGLISH MODERN SCHOOL
DOHA – Q ATAR
REVISION ON ELECTROMAGNETIC INDUCTION
NAME………………………………..DATE…
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voltage
0.01 0.02 0.03 0.04 0.05 ts0.0!
2
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4.
5.
!.
+
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1.
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".
#.
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$.
10.
11.
/
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12.
Indicate the direction o#
current.
13.
14.
15.
0
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1!.
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1".
1#.
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1$.
20.
21.
1-
3oo" at the diagram o# a generator.
(a) &hat do la!el$ % to 4 5epre$ent?
(b) 'plain why the generator produce$ an a.c.
current rather than a d.c. current
when the coil rotate$ in$ide the magnetic #ield.
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22.
23.
11
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24.%oo& at the following transformer'
6ow could thi$ tran$#ormer !e u$ed in the ational 7rid?
A to $tep up d.c. voltage$ to higher level$
B to $tep down d.c. voltage$ to lower level$
C to $tep up a.c. voltage$ to higher level$
D to $tep down a.c. voltage$ to lower level$
25.
2/. 8here are 2- turn$ o# wire on the primary coil and the
primary voltage i$ 12 9. 6ow many turn$ o# wire
would !e needed on the $econdary coil to produce a $econdary
voltage o# 2- 9?
A - turn$ B -- turn$ C 2-- turn$ D 2- --- turn$
20. 8he power developed in the primary coil i$ 12-- &. 8he
current in the $econdary coil i$
%. &hat i$ the value o# the $econdary voltage under the$e
condition$?
A / 9 B 2- 9 C 2- 9 D 2--- 9
12
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2#.
2$.
1+
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30.
1
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31.
1
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32.
1/
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33.
10
e#ore ru!!ing
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34.
1
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1
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35.
2-
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3!.
21
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+0.
22
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+.
2+
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2
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3$.
2
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2/
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