Electromagnetic Induction Test

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Electromagnetic Induction Test - 21

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Question 1
1 / -0

A coil of insulated copper wire is connected to a galvanometer. What would happen if a bar magnet is (i) Pushed into the coil?

A
The galvanometer shows deflection

B
The galvanometer do not show any deflection

C
Current increases inside the coil

D
none

Solution

Due to change in magnetic flux linked with coil, the galvanometer shows deflection (say towards right). The galvanometer will show a deflection towards left when the bar magnet is withdrawn from inside the coil.
Question 2
1 / -0

When a straight wire is moved up and down rapidly between two poles of a horseshoe magnet then _______ is produced in the wire.

A
magnetic field

B
magnetic current

C
electric current

D
none

Solution

An electric current is produced in the wire. The production of electricity from magnetism is called electromagnetic induction
Question 3
1 / -0

In the field of electromagnetism, the term 'EMI' stands for:

A
Electromotive Impact

B
Electromagnetic Induction

C
Electromotive inertia

D
none of these

Solution

In the field of electromagnetism, the term EMI stands for Electro Magnetic Induction.
Question 4
1 / -0

Mark the incorrect statement.

A
electric current produces magnetism.

B
magnets can produce electric current.

C
magnets can't produce electric current.

D
a and b

Solution

A magnet can generate electric current by the means of electromagnetic induction. When there is a relative motion between a coil and a magnet, the magnetic flux linked to the coil changes due to that relative motion. This change in magnetic flux will induce a current in the coil, which is known as $$induced\ current$$.
Question 5
1 / -0

A copper rod of length $$l$$ is rotated about one end, perpendicular to the uniform magnetic field $$B$$ with constant angular velocity $$\omega $$. The induced emf between two ends of the rod is:

A
$$\dfrac { 1 }{ 2 } B\omega { l }^{ 2 }$$

B
$$B\omega { l }^{ 2 }$$

C
$$\dfrac { 3 }{ 2 } B\omega { l }^{ 2 }$$

D
$$2B\omega { l }^{ 2 }$$

Solution

A copper rod of length l is rotated about one end, perpendicular to the uniform magnetic field B with constant angular velocity ω. The induced emf between two ends of the rod is
The EMF induced is $$dE=\dfrac{BdA}{dt}=Bvdx$$
$$v=wx$$
$$dE=Bwxdx$$
$$dE=\int^l_0 Bwxdx$$
$$dE=Bw\dfrac{x^2}{2}=\dfrac{1}{2}Bwl^2$$
Question 6
1 / -0

Electric current produced by a moving straight wire in a magnetic field is?

A
Magnetic Current

B
Electrostatic Current

C
Induced Current

D
None

Solution

Electric current produced by a moving straight wire in a magnetic field is Induced Current
The current due to the emf induced due the change in magnetic flux of a coil when a magnet is inserted in it is induced current.When in a coil there is change in magnetic flux an emf is generated such that it opposes the change in magnetic flux. The current generated due to this emf is known as induced current.
Question 7
1 / -0

When a coil is moved or rotated relative a fixed magnet then

A
voltage increased

B
current is induced

C
both

D
voltage is induced

Solution

After performing a large number of experiments, Faraday and Henry made the following observations about electromagnetic induction
1)a current is induced in a coil when it is moved(rotated)relative to a fixed magnet.
2)a current is also induced in a fixed coil when a magnet is moved (or rotated)relative to the fixed coil.
3) no current is induced in a coil when the coil and magnet both are stationary relative to one another.
4) when the direction of motion of coil (or magnet) is reversed , the direction of current induced in the coil also get reversed.
5) the magnitude of current induced in the coil can be increased.
A) by winding the coil on a soft iron core.
B)by increasing the number of turns in the coil.
C) by increasing the strength of magnet.
D) by increasing the speed of rotation of coil (magnet).
Question 8
1 / -0

The induction coil works on the principle of.

A
Self-induction

B
Mutual induction

C
Ampere's rule

D
Fleming's right hand rule

Solution

Induction coil works on the principle of mutual induction that an emf or current is induced in the second coil if the magnetic flux due to first coil linked with the second coil changes.
Question 9
1 / -0

Which of the following best describe the electromagnetic induction?

A
The ability of a changing magnetic field to induce a voltage in a conductor

B
The ability of a conductor to generate a magnetic field

C
The ability of a static magnetic field to induce a voltage in a conductor

D
The ability of a permanent magnet to induce a voltage in a coil

E
The ability of a conductor to induce a magnetic field

Solution

Electromagnetic induction is a process where a conductor placed in a changing magnetic field (or a conductor moving through a stationary magnetic field) causes the production of a voltage across the conductor.
Changing magnetic field causes a change in flux which gives rise to induced emf.
Also, a moving rod in a uniform magnetic field would mean moving electrons in a magnetic field which would exert force on them to move in a particular direction in the rod, thus creating a potential difference across ends.
Question 10
1 / -0

What is the unit for EMF?

A
Ampere

B
Potential

C
Watt

D
Volt

Solution

EMF is defined as the voltage developed by the electrical energy source.
For example : Battery
Thus EMF has the unit of volt denoted by $$V$$.

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Electromagnetic Induction Test - 21

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Electromagnetic Induction Test - 21

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Question 1

The galvanometer shows deflection

The galvanometer do not show any deflection

Current increases inside the coil

none

Solution

Question 2

magnetic field

magnetic current

electric current

none

Solution

Question 3

Electromotive Impact

Electromagnetic Induction

Electromotive inertia

none of these

Solution

Question 4

electric current produces magnetism.

magnets can produce electric current.

magnets can't produce electric current.

a and b

Solution

Question 5

$$\dfrac { 1 }{ 2 } B\omega { l }^{ 2 }$$

$$B\omega { l }^{ 2 }$$

$$\dfrac { 3 }{ 2 } B\omega { l }^{ 2 }$$

$$2B\omega { l }^{ 2 }$$

Solution

Question 6

Magnetic Current

Electrostatic Current

Induced Current

None

Solution

Question 7

voltage increased

current is induced

both

voltage is induced

Solution

Question 8

Self-induction

Mutual induction

Ampere's rule

Fleming's right hand rule

Solution

Question 9

The ability of a changing magnetic field to induce a voltage in a conductor

The ability of a conductor to generate a magnetic field

The ability of a static magnetic field to induce a voltage in a conductor

The ability of a permanent magnet to induce a voltage in a coil

The ability of a conductor to induce a magnetic field

Solution

Question 10

Ampere

Potential

Watt

Volt

Solution

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