NAME :
CLASS :
IB Electric fields
DATE :
20 Questions
1.
Two copper wires X and Y are connected in series. The
diameter of Y is double that of X. The drift speed in X is v.
What is the drift speed in Y?
a) v/4
b) v/2
c) 2v
d) 4v
2.
Two point charges Q1 and Q2 are one metre apart. The graph
shows the variation of electric potential V with distance x from
Q1. What is Q1/Q2
a) 1/16
b) 1/4
c) 4
d) 16
3.
An electron enters the region between two charged parallel
plates initially moving parallel to the plates.
The electromagnetic force acting on the electron
a) causes the electron to decrease its horizontal
speed
c) is parallel to the field lines and in the opposite
direction to them
b) causes the electron to increase its horizontal
speed
d) is perpendicular to the field direction
4.
An ion of charge +Q moves vertically upwards through a small
distance s in a uniform vertical electric field. The electric field
has a strength E and its direction is shown in the diagram.
What is the electric potential difference between the initial and
final position of the ion?
a)
EQ
s
b) EQs
c) Es
5.
d) E/s
An electron is accelerated through a potential difference of 2.5
MV. What is the change in kinetic energy of the electron?
0.4μJ
b) 0.4 nJ
c) 0.4 pJ
d) 0.4 fJ
a)
6.
The diagram shows two equal and opposite charges that are
fixed in place.
At which points is the net electric field directed to the right?
a) X and Y only
b) Z and Y only
c) X and Z only
d) X, Y and Z
7.
Positive charge is uniformly distributed on a semi-circular
plastic rod. What is the direction of the electric field strength at
point S?
a) A
b) B
c) C
d) D
8.
What is the definition of electric current?
a) The ratio of potential difference across a
component to the resistance of the
component
b) The power delivered by a battery per unit
potential difference
c) The rate of flow of electric charge
d) The energy per unit charge dissipated in a
power supply
9.
Which diagram represents the pattern of electric field lines of
two small positive point charges held at the positions shown?
10.
11.
a)
b)
c)
d)
Coulomb’s law refers to electric charges that are
a) on any charged objects
b) charged hollow spheres
c) charged solid spheres
d) point charges
One electronvolt is equal to
a) 1.6×10−19 C
b) 1.6×10−19 J
c) 1.6×10−19 V
d) 1.6×10−19 W
12.
In the diagram below, P is a point near a negatively charged
sphere. Which direction best represents the direction of the
electric field at point P?
a) Right
b) Left
c) Up
d) Down
13.
Which of the following is a true statement about the electric
field between the two plates?
a) The field is attractive between the plates and
b) The field is repulsive between the plates and
uniform in strength
uniform in strength
c) The field is attractive between the plates and
d) The field is repulsive between the plates and
strongest near the positive
14.
strongest near the positive
According to Coulomb's Law, The greater the separation
distance between two charges the greater the magnitude of
the electric force. True or False?
a) True
15.
b) False
Which of the following charges is the best example of
'Charged is Quantized'?
16.
a) 2.1 x 10-19 C
b) 3.2 x 10-19 C
c) 2.4 x 10-19 C
d) 7.2 x 10-19 C
The S.I. unit for electric field is__________?
a) nC
b) μC
c) n/C
d) N/m
e) none of the above
17.
Where can an electric field be found?
a) below a force field
b) in a gravitational field
c) in the space surrounding a charged object
d) outside of a magnetic field
18.
Which charges particle has the larger electric field applied to
it?
a) A
b) B
c) they are the same
d) can not be determined
19.
The charge on the left is ____ and the charge on the right is
___
a) positive ; positive
b) negative ; negative
c) negative ; positive
d) positive ; negative
20.
What direction is the resultant net force on the grey test charge
in this figure?
a)
b)
c)
d)
Answer Key
1.
a
6.
c
11.
b
16.
e
2.
3.
d
c
7.
8.
b
c
12.
13.
b
a
17.
18.
c
c
4.
c
9.
b
14.
b
19.
d
5.
c
10.
d
15.
b
20.
d