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EMF_U3_Electric Filed in Materials

Total questions: 40

Worksheet time: 21mins

Name
Class
Date
1.

Which of the phenomena suggests that light may be a transverse wave?

a)

Interference

b)

Diffraction

c)

Reflection

d)

Polarization

2.

The plane in which electric field vector of plane polarised light vibrates is known as

a)

Plane of vibration

b)

Plane of polarisation

c)

Principle plane

d)

none of these

3.

This is the picture of

a)

electric dipole

b)

magnetic dipole

c)

electric monopole

d)

magnetic monopole

4.

Which of the following is not a dielectric

a)

glass

b)

paper

c)

wood

d)

mercury

5.

The electric dipole moment in this case is

a)

q. (2a)

b)

q. a

c)

q. (2a) a vector directed from negative to positive charge

d)

q. (2a) a vector directed from positive to negative charge

6.

The process described here is

a)

electric polarization

b)

magnetization

c)

dielectric polarization

d)

diamagnetic polarization

7.

Which type of polazability is shown here

a)

electronic

b)

ionic

c)

orientational

d)

interstitial

8.

In presence of external electric field atoms inside a lattice undergoes

a)

electronic polarization

b)

ionic polarization

c)

orientational polarization

d)

interstitial polarization

9.

Ferroelectric material shows

a)

sponteneous polarization in absence of field

b)

polarization in presence if field

c)

Internal polarization in presence if field

d)

Internal polarization

10.
Which of the following statements is false about electric field lines
a)
electric field lines cannot cross
b)
electric field lines point away from positive charge
c)
electric field lines are always straight lines
d)
electric field lines show how a proton would move in an electric field
11.
At which point is the electric field the strongest
a)
A
b)
B
c)
C
d)
D
12.
Consider the electric field lines shown in the diagram below. From the diagram, it is apparent that object A is ____ and object B is ____.
a)
+,+
b)
+,-
c)
-,+
d)
-,-
13.
It is observed that Balloon A is charged negatively. Balloon B exerts a repulsive effect upon balloon A. Would the electric field vector created by balloon B be directed towards B or away from B and why?
a)
towards because electric field lines point away from negative charges
b)
towards because electric field lines point away from positive charges
c)
away because electric field lines point away from negative charges
d)
away because electric field lines point toward positive charges
14.
QA and QB are two charges creating an electric field. Based on the electric field lines, we can conclude
a)
QA and QB are both positive
b)
QA and QB are both negative
c)
QA is positive and QB is negative
d)
QA is negative and QB is positive
15.
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 uniform in strength
b)
The field is repulsive between the plates and uniform in strength
c)
The field is attractive between the plates and strongest near the positive
d)
The field is repulsive between the plates and strongest near the positive
16.
The electrical force between charges is strongest when the charges are
a)
close together
b)
far apart
c)
 the electric force is constant everywhere.
d)
there is no pattern
17.
Electric charges that are different _______ each other.
a)
Attract
b)
Repel
18.
Electric charges that are alike _______ each other.
a)
Attract
b)
Repel
19.
What is the SI unit used to measure force? 
a)
pounds 
b)
grams 
c)
newtons 
d)
friction
20.

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

b)

False

21.
If an object has a net charge of +2e this means it has
a)
lost 2 electrons
b)
gained 2 electrons
c)
lost 2 protons
d)
gained 2 protons
22.
What do you call the process of charging a conductor by bringing it near another charged object?
a)
induction
b)
polarization
c)
neutralization
d)
conduction
23.
A Capacitor
a)
provide a specific value of capacitance
b)
stores energy in a electrostatic field 
c)
opposes any change in voltage
d)
all of the above
24.
The insulating layer of a cacitor is called the 
a)
plate
b)
conductors
c)
dielectric
d)
terminals
25.
The amount of charge that a capacitor can accept is determined by 
a)
It's capacity C=Q/V
b)
the plate area
c)
the dielectric thickness
d)
all of the above
26.
A charged capacitor act like 
a)
a DC open
b)
a momentary open
c)
a inverse voltage
d)
a current source
27.
When a capacitor discharges
a)
current reverses direction compared to the charge current
b)
it acts like a DC open
c)
the electrostatic charge remains 
d)
plate voltage increases
28.
Capacitance is inversely proportional to 
a)
a charge
b)
dielectric thickness 
c)
plate area
d)
applied voltage
29.
Capacitors well hold a charge until
a)
the applied voltage drops to zero
b)
5 time constants
c)
an external discharge path is provided
d)
1 time constant
30.
The capacitance of a parallel-plate capacitor can be increased by: 
a)
increasing the charge 
b)
decreasing the charge 
c)
increasing the plate separation
d)
decreasing the plate separation 
31.
What is the voltage across   the plates of the capacitor if  the capacitance is 10 uF and the Charge stored is  30 uC?
a)
0.333 V
b)
3 V
c)
300 V
32.
------------------------ is created out of two metal plates and an insulating material called a dielectric.
a)
An inductor
b)
A capacitor
c)
A fixed resistor
d)
A variable resistor
33.
In the capacitor, the dielectric can be made out of all sorts of ---------- materials and the plates are made of a -------------- material.
a)
conductive, insulating 
b)
conductive, conductive
c)
insulating, conductive
d)
insulating, insulating
34.

With respect to the capacitor, which relationship is true? •

a)

C = Q×V

b)

V = C×Q

c)

V = Q/C

d)

Q = C/V

35.

How is the capacitance of a parallel-plate capacitor affected by the potential difference across the capacitor ?

a)

C depend on the potential difference across the capacitor

b)

C does not depend on the potential difference across the capacitor

c)

C partially depend on the potential difference across the capacitor

d)

C sometime depend on the potential difference across the capacitor

36.

How is the capacitance of a parallel-plate capacitor affected by the area of each plate?

a)

C is directly proportional to the area A of each plate

b)

C is inversely proportional to the area A of each plate

c)

C is partially proportional to the area A of each plate

d)

C is fully proportional to the area A of each plate

37.

How is the capacitance of a parallel-plate capacitor affected by the distance between the plates ?

a)

C is directly proportional to the area A of each plate

b)

C is inversely proportional to the distance d between the plates

c)

C is partially proportional to the area A of each plate

d)

C is not affected by the area A of each plate

38.
If C is the capacitance in Farads, ϵ permittivity of the dielectric, A area of plate overlap in square meters and d distance between plates in meters, then:
a)
C = ϵd/A 
b)
C = A/ϵd
c)
C = ϵA/d
d)
C = d/ϵA
39.

Is it correct to say that the capacitance is inversely proportional to the area of the parallel plates?

a)

True

b)

False

40.

Capacitor is a device use to store energy. Therefore a solar cell is a type of capacitor.

a)

True

b)

False

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