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EMT UNIT 4-I

Total questions: 50

Worksheet time: 37mins

Name
Class
Date
1.

In a pure inductive circuit, the current

a)

lags emf by angle 90

b)

lags emf by 180

c)

leads emf by 90

d)

leads emf by 180

2.

what will be the current I in a circuit if total moving Charge is q

a)

dq/dt

b)

-dq/dt

c)

qt

d)

none

3.

According to the laws of electromagnetic induction

 ∇×\nabla\times  E is equal to

a)

0

b)

ϵ/​ρ​.

c)

​ρ/​ϵ

d)

−dB​/dt

4.

An inductor stores energy in

a)

electric field

b)

coil

c)

magnetic field

d)

air

5.

is displacement current is produced by moving charges

a)

yes

b)

no

6.

Are the magnetic field lines in the picture correct?

a)

Yes, because they point from north to south.

b)

No, because they point from north to south (they're supposed to go the other way).

c)

Yes, because the North pole is on the left in all pictures.

d)

No, because the North pole is on the left in all pictures (it's supposed to be on the right).

7.

Which scientist created a mathematical formula to explain how a current is induced by a magnetic field?

a)

Oersted

b)

Farraday

c)

Maxwell

d)

Tesla

8.
___ Law says that the Induced current is proportional to the change of magnetic flux 
a)
Lenz'
b)
Faraday's
c)
Ampere's
9.
In 1831 who discovered electromagnetic induction?
a)
Thomas Edison
b)
Nikola Tesla
c)
Michael Faraday
10.

Magnetic flux is related to magnetic field strength by the formula

a)

Φ=BA

b)

Φ=BA2

c)

Φ=B/A

d)

Φ=B/A2

11.

When a charged particle moving with velocity v enters a magnetic field at right angles it will be forced into a circular path with radius r given by

a)

mv/Bq

b)

Bq/mv

c)

mv2/Bq

d)

none of these

12.

The size of the force exerted on a moving charge relative to an external magnetic field is given by

a)

Bqv

b)

Bqvcosθ

c)

Bqvsinθ

d)

none of these

13.

F = qvB If the speed and charge double, what happens to the magnetic force?

a)

halves

b)

remains the same

c)

doubles

d)

quadruples

14.

Faraday’s law states that an induced emf is proportional to

a)

The rate of change of the magnetic field

b)

the rate of change of the electric field

c)

the rate of change of the magnetic flux

d)

the rate of change of the electric flux

15.

If the magnetic flux through a certain region is changing with time:

a)

energy must be dissipated as heat

b)

an electric field must exist at the boundary

c)

a current must flow around the boundary

d)

an emf must exist around the boundary

16.

Which activity will produce the highest current?

a)

Move the magnet bar into the coil while the coil remains stationery

b)

Move the coil into the magnet bar while the magnet remains stationery

c)

Move the coil and magnet towards each other

d)

Move the coil and magnet away from each other

17.

Faradays law states that

a)

Direction of induces emf determined by this rule

b)

Induced current always flow the opposed magnetic field

c)

The magnitude of induced directly proportional to the rate of change magnetic flux

18.

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

19.

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

20.

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

21.

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

22.

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

23.

•Maxwell calculated the speed of light to be

a)

3x108m/s.3x10^8m/s.

b)

3x104m/s.3x10^4m/s.

c)

speed of sound

d)

fluctuating based on the temprature

24.

Maxwell concluded that visible light and all other electromagnetic waves consist of fluctuating electric and magnetic fields, with each varying field inducing the other.

a)

True

b)

False

25.

The ratio of the electric field to the magnetic field in an EM wave equals the speed of light.

a)

True

b)

False

26.

Electromagnetic waves come in various forms.

•Visible light

•Infrared

•Radio

•X-rays

a)

True

b)

False

27.

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

28.
___ Law defines the magnetic field generated by a long straight wire
a)
Lenz'
b)
Faraday's
c)
Ampere's
29.
Electromagnetic induction is change in ___________________. 
a)
surface area
b)
magnetic poles
c)
magnetic flux
30.

Which law was modified by Maxwell

a)

Lenz Law

b)

Faraday's Law

c)

Gauss Law

d)

Ampere's Law

31.

Which of the following is the expression for Lorentz force?

a)

qE

b)

q (v X B)

c)

ma + qE

d)

qE + q (v X B)

32.

The entire theory of electromagnetic waves is contained in Maxwell’s equations.

a)

False

b)

True

33.

Differential form of Gauss’s law in magneto statics is _____________

a)

div B = ρ/εo

b)

div B = 0

c)

div B = -dB/dT

d)

div B = μJ

34.

Magnetic field can be produced by ___________

a)

Conduction current

b)

Displacement current

c)

Both conduction and displacement current

d)

It is produced naturally

35.

Find the Maxwell equation derived from Faraday’s law.

a)

Div(H) = J

b)

Div(D) = I

c)

Curl(E) = -dB/dt

d)

Curl(B) = -dH/dt

36.

In which of the following forms can Maxwell’s equation not be represented?

a)

Static

b)

Point

c)

Integral

d)

Harmonic

37.

Maxwell Equations Tells about how fluctuating electric and magnetic fields propagate at a constant speed

a)

True

b)

False

38.

If any one of the Maxwell equation is not satisfied then we can say the EM field will not exists.

a)

True

b)

False

39.

What is the shape of a magnetic field around a wire?

a)
b)
c)
d)
40.
How are electromagnets different from magnets?
a)
magnets can be turned on/off
b)
you can turn an electromagnet on/off
c)
magnets are more powerful
d)
magnets have a North and South pole
41.
จากกฎการเหนี่ยวนำทางแม่เหล็ก ในบริเวณที่สนามแม่เหล็กมีการเปลี่ยนแปลง จะมีการเหนี่ยวนำให้เกิดสนามไฟฟ้าขึ้นในบริเวณนั้นดังแสดงในรูป ก และ ข ถ้า ΔB ชี้ทิศเดียวกับ B แสดงว่าสนามแม่เหล็กเพิ่มขึ้น และถ้า ΔB ชี้ทิศตรงข้ามกับ B แสดงว่าสนามแม่เหล็กลดลง อยากทราบว่าสนามไฟฟ้าที่เกิดขึ้นจะเกิดขึ้นในทิศทางใด ตามลำดับ
a)
E1 และ E3
b)
E1 และ E4
c)
E2 และ E3
d)
E2 และ E4
42.

The electric field inside a spherical shell of uniform surface charge density is

a)

Constant, less than zero

b)

Directly proportional to the distance from the centre

c)

zero

d)

None of the above

43.

Electric lines of force about negative point charge are

a)

Circular, anticlockwise

b)

Circular, clockwise

c)

Radial, outward

d)

Radial, inward

44.

 ABC is an equilateral triangle. Charges +q are placed at each corner. The electric intensity at O will be

a)

 14π∈0(qr2)\frac{1}{4\pi\in_0}\left(\frac{q}{r^2}\right)  

b)

 14π∈0(qr)\frac{1}{4\pi\in_0}\left(\frac{q}{r^{ }}\right)  

c)

 14π∈0(3qr2)\frac{1}{4\pi\in_0}\left(\frac{3q}{r^2}\right)  

d)

zero

45.

Figure shows the electric lines of force emerging from a charged body. If the electric field at A and B are EA and EB respectively and if the displacement between A and B is r then

a)

EA > EB

b)

EA < EB

c)

EA = EB / r

d)

EA = EB / r2

46.

A charge particle is free to move in an electric field. It will travel

a)

Always along a line of force

b)

Along a line of force, if its initial velocity is zero

c)

Along a line of force, if it has some initial velocity in the direction of an acute angle with the line of force

d)

None of the above

47.

There is a solid sphere of radius ‘R’ having uniformly distributed charge. What is the relation between electric field ‘E’ (inside the sphere) and radius of sphere ‘R’ is

a)

 E∝R−2E\propto R^{-2}  

b)

 E∝R−1E\propto R^{-1}  

c)

 E∝R2E\propto R^2  

d)

 E∝1R3E\propto\frac{1}{R^3}  

48.
Magnetic field lines are closet together at the __________.
a)
poles
b)
lines
49.
magnetic field
a)
the space around a magnet in which magnetic forces can act on objects
b)
to separate or set apart
c)
one of the two opposite ends of a magnet
d)
to provide evidence that goes against a claim
50.

Which of the following most closely resembles an electromagnetic?

a)
b)
c)
d)

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