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9 Marking Scheme: Worksheet (AS) : 1 B 2 C 3 D 4 D 5 B 6 The Two Units Are: V M

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242 views2 pages

9 Marking Scheme: Worksheet (AS) : 1 B 2 C 3 D 4 D 5 B 6 The Two Units Are: V M

Uploaded by

Ruby Chong
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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9 Marking scheme: Worksheet (AS)

 1 B [1]
 2 C [1]
 3 D [1]
 4 D [1]
 5 B [1]
 6 The two units are: V m–1 [1]
and N C–1. [1]
F 1.5  10 3
 7 E = = [1]
Q 5.0  10 8
E = 3.0  104 V m–1 [1]
 8 F = EQ = 5.0  105  3.2  10–19 [1]
F = 1.6  10–13 N [1]
V 600
 9 a E= = [1]
d 3.0  10  2
E = 2.0  104 V m–1 [1]
The field acts towards the negative plate. [1]
b The electric field is uniform between the plates (except at the ‘edges’). [1]
The electric field is at right angles to the plate. [1]
c i Since the droplet is stationary,
the electric force on the droplet
must be equal and opposite to its weight. [1]
The electric force must act upwards,
so the charge on the droplet must
be negative. [1]

F
ii E =
Q
F 6.4  10 15
Q= = [1]
E 2.0  10 4
Q = 3.2  10–19 C [1]
10 a F  QE =1.60  10–19  2.4  106 [1]
F = 3.84  10−13 N  3.8  10−13 N [1]
F
b F  ma  a = [1]
m
3.84  10 13
a= N
1.67  10  27
a = 2.30  1014 m s−2 [1]
c Zero; the force is at right angles to the field. [1]

AS and A Level Physics Original material © Cambridge University Press 2010 1


9 Marking scheme: Worksheet (AS)

V 200
11 E= =  10−2 = 4.0  103 N [1]
d 5
F 3.2  10 4
F = EQ  Q = = [1]
E 4.0  103
Q = 8.0  10−8 C [1]

AS and A Level Physics Original material © Cambridge University Press 2010 2

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