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Worksheets

ANTENNA

Total questions: 45

Worksheet time: 27mins

Name
Class
Date
1.
When distance increases, electrostatic force ____________; we call this relationship ____________ proportional
a)
decreases;directly
b)
decreases;inversely
c)
increases;inversely
d)
increases;directly
2.
What variable is a Coulomb the unit for?
a)
Charge
b)
Force
c)
Distance
d)
Mass
3.
What variable do Coulombs represent?
a)
Electrostatic Charge
b)
Force
c)
Distance
d)
Mass
4.

The graph shows the relationship between the force of interaction and the magnitude of charge. What type of relationship is this?

a)

Direct

b)

Indirect

c)

Inverse

d)

Reverse

5.
How do electrons differ from protons?
a)
They are the same thing
b)
Electrons hold a negative charge and protons hold a positive charge.
c)
Electrons are positively charged and protons are negatively charged.
d)
Protons are neutral 
6.
The Electric Force is strongest when charges are...
a)
close together
b)
far apart
c)
the electric force is constant everywhere
7.

Which two particles are attracted to each other?

a)

Two neutrons

b)

A proton and an electron

c)

Two protons

d)

An electron and a neutron

8.

What is the SI unit for charge?

a)

Joules

b)

Coulombs

c)

Newtons

d)

Meters

9.
Electrostatic force F is directly proportional to:
a)
r^2 (distance squared)
b)
q1
c)
q2
d)
both q1 and q2
10.
What is the name of this device that is used to detect charges?
a)
beaker
b)
electroscope
c)
van de graff generator
d)
chargometer
11.

Coulomb's law says that the force between any two charges depends

a)

directly on the size of the charges

b)

inversely on the square of the distance between the charges

c)

both are correct

12.

Which is the value of the constant in Coulomb's equation?

a)

k = 9·10-9

b)

k = 9.8

c)

k = 6.67·10-11

d)

k = 9 ·109

13.

The variable "r" in Coulomb's Law would have what units?

a)

Joules

b)

Coulombs

c)

Newtons

d)

Meters

14.
An asymmetrical shaped conducting shell is uncharged, and contains a point charge +q, which of the following is true?
a)
the electric filed just above the surface is zero.
b)
The electric potential between the charge and the shell is zero
c)
the electric flux through the shell is q/εo
d)
None
15.
The electric flux Φ through a surface
a)
is the amount of electric field piercing the surface
b)
is the electric field multiplied by the area.
c)
does not depend on the area involved
d)
is the line integral of the electric field around the edge of the surface
16.

 Fig. shown is a distribution of charges. The flux of electric field due to these charges through the surface S is

a)

3q∈0\frac{3q}{\in_0}

b)

q∈0\frac{q}{\in_0}

c)

zero

d)

2q∈0\frac{2q}{\in_0}

17.

The S.I. unit of electric flux is

a)

Joule per coulomb

b)

Newton per coulomb

c)

Weber

d)

Volt metre

18.

If i want to find the rotation of a vector A What should i do ?

a)

take divergence

b)

take curl

c)

take gradient

d)

view in microscope

19.

Which law talks about the force between two charges?

a)

Faraday

b)

Gauss

c)

Coulombs

d)

Force law

20.

Force between two charges are is --------------- proportional to -------------- of charges

a)

inversely, sum

b)

directly , sum

c)

inversely , product

d)

directly , product

21.

which are correct

a)

F=Eq

b)

D=eE

c)

f prortional to 1/q

d)

f is proportional to 1/r^2

22.

The magnetic field lines near a long straight wire carrying current are:

a)

Straight lines

b)

Concentric rings

c)

Spiral lines

d)

Radial lines

23.

 The magnetic field at the center O' of the following current loop is

a)
b)
c)
d)
24.

Moving charges, or an electric current, produces a magnetic field.

a)

Gauss's Law

b)

Ohm's Law

c)

Ampere's Law

d)

Law of Conservation of Magnetism

25.

What is the unit of magnetic field?

a)

ampere

b)

watt

c)

kilowatt hour

d)

tesla

26.

1) A wire carries a current, creating a magnetic field around itself as shown. The current in the wire is:

a)

A. Directed to the right

b)

A. Directed to the left

c)

A. Equal to the magnetic field

d)

In the same direction as the magnetic field

27.

Gauss's law is:

a)

Equation 1

b)

Equation 2

c)

Equation 3

d)

Equation 4

28.

Faraday's Law is

a)

Equation 1

b)

Equation 2

c)

Equation 3

d)

Equation 4

29.

Ampere's Law is

a)

Equation 1

b)

Equation 2

c)

Equation 3

d)

Equation 4

30.

Magnetic Flux formula

a)

Equation 1

b)

Equation 2

c)

Equation 3

d)

Equation 4

31.

The equation that says changing electric field creates magnetic field

a)

Equation 1

b)

Equation 2

c)

Equation 3

d)

Equation 4

32.

The equation that says magnetic field lines form closed loops

a)

Equation 1

b)

Equation 2

c)

Equation 3

d)

Equation 4

33.

The equation that says electric currents create magnetic fields:

a)

Equation 1

b)

Equation 2

c)

Equation 3

d)

Equation 4

34.

The equation that says changing magnetic flux creates electric field

a)

Equation 1

b)

Equation 2

c)

Equation 3

d)

Equation 4

35.

Which of the equations must be modified if

magnetic monopoles are discovered?

a)

Equation 1

b)

Equation 2

c)

Equation 3

d)

Equation 4

36.

Which of the above states that a changing electric

flux through a closed loop or an electric current

through the loop creates a magnetic field around the

loop?

a)

Equation 1

b)

Equation 2

c)

Equation 3

d)

Equation 4

37.

Which of the following cannot be computed using the Biot Savart law?

a)

Magnetic field intensity

b)

Magnetic flux density

c)

Electric field intensity

d)

Permeability

38.

The Ampere law is based on which theorem?

a)

Green’s theorem

b)

Gauss divergence theorem

c)

Stoke’s theorem

d)

Maxwell theorem

39.

Based on Maxwell starting points

Electric field lines:

a)

Originate on positive charges and terminate on negative charges.

b)

Originate on negative charges and terminate on positive charges.

c)

Can be originated on either charges but terminates only on negative charges.

d)

Form closed loops

40.

Based on Maxwell starting points:

•Magnetic field lines :

a)

always form closed loops – they do not begin or end anywhere.

b)

they can form closed or open loops – they begin at specific point but end anywhere.

c)

originate on south poles and terminate on north poles.

d)

magnetis can be found as separate poles

41.

One of Maxwell's starting points was

A varying magnetic field:

a)

induces an emf and hence an electric field

b)

induces only an emf

c)

induces only an electric field

d)

induces ultraviolet catastrophe

42.

Based on Maxwell's starting points

•Magnetic fields are generated :

a)

by moving charges or currents

b)

by still charges

c)

by chemical reactions

d)

by summer and hot weather

43.

Maxwell hypothesized that a changing electric field would produce a magnetic field. and edited which equation:

a)

Gauss's Law

b)

Faraday's Law

c)

Ampere's Law

d)

Magnetic flux through a closed loop formula

44.

When light (or other electromagnetic radiation) travels across a given region, which of the following

is/are oscillating?

I. Electric field

II. Magnetic field

III. Energy

a)

I only

b)

II only

c)

III only

d)

I and II only

e)

I, II and III

45.

In general, which condition of motion MUST be met with regards to a charged particle if it is in the process of emitting electromagnetic waves?

a)

Accelerates

b)

Moves in a circle

c)

Moves at constant velocity

d)

Moves at the speed of light

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