Magnetic Effects of Electric Current Test

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Magnetic Effects of Electric Current Test - 19

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Weekly Quiz Competition

Question 1
1 / -0

$$15 A$$ current rating used for ________ appliances.

A
Low power rating

B
High power rating

C
Medium power rating

D
All
Question 2
1 / -0

Each electrical appliance is provided with a _______ core flexible cable. Fill in the blank.

A
3

B
2

C
1

D
4

Solution

Each electrical appliance is provided with three (3) core flexible cables. The insulation on the three wires is of different colours i.e Brown for live wire, blue for neutral wire and green or yellow for earth wire.
Question 3
1 / -0

The direction of the force acting on a current carrying conductor when placed in a magnetic field can be obtained by

A
Fleming left hand rule

B
Fleming right hand rule

C
Both

D
None

Solution

Fleming left hand rule is used to find out the direction of motion of a current carrying conductor when placed in a magnetic field.

According to this rule, stretch the thumb, forefinger and middle finger of your left hand such that they are mutually perpendicular. If the first finger points in the direction of magnetic field and the second finger in the direction of current, then the thumb will point in the direction of motion or the force acting on the conductor
Question 4
1 / -0

On what principle electric motor works?

A
Principle of force experienced by current carrying conductor in magnetic field

B
Principle of current experienced by current carrying conductor in magnetic field

C
Principle of force experienced by current carrying conductor in electric field

D
None of the above

Solution

An electric motor converts electrical energy into mechanical energy.
Current is passed through an armature, which placed under an external magnetic field experiences force on its arms and causes the armature to rotate.Hence based on the principle of force experienced by current carrying conductor in magnetic field.
Question 5
1 / -0

According to new convention, earth wire is coded by

A
Green colour

B
Black colour

C
Red colour

D
All

Solution

According to new convention, live wire of codded by brown colour, neutral wire is coded by light blue colour whereas earth wire is coded by green and yellow colour.
Question 6
1 / -0

A straight wire of 0.3 m carrying a current of 2 A in the downward direction is placed in a magnetic field of 0.1 T as shown in the figure. Find out the direction of the force on the wire?

A
Into the page

B
Out of the page

C
Toward the top of the page

D
Toward the bottom of the page

E
To the left

Solution

The direction of magnetic force on a current carrying conductor placed perpendicular to the magnetic field is given by Fleming's left hand rule. Using this rule, it can be concluded that the direction of force on wire is out of the page.
Question 7
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 8
1 / -0

A current carrying conductor.

A
Experience a force when it is in magnetic field

B
Does not experience a force when it is in magnetic field

C
Experiences the force only when the field is electromagnetic in nature

D
None of the above

Solution

As per right hand thumb rule, when a current carrying conductor is in magnetic field, it experiences force as
$$F=IlB\sin\theta$$
Question 9
1 / -0

According to new convention,_____colour is used for live wire. Fill in the blank.

A
Red

B
Brown

C
Light blue

D
Green

Solution

According to new convention, brown colour is coded for live wire, light blue is coded for neutral wire and green or yellow is coded for earth wire.
Question 10
1 / -0

Change in number of magnetic field lines induces

A
current in coil

B
EMF in the coil

C
frequency in coil

D
both A and C

Solution

As per Faraday's law, the change in magnetic flux associated with coil produces an EMF in the coil. Whenever there is a change in magnetic flux associated with a coil, an EMF is induced in the coil. Magnetic flux is defined as the number of field lines passing normally through a given area. When magnetic flux changes, obviously, it means that, the number of magnetic field lines change.

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Re-Attempt Weekly Quiz Competition

Magnetic Effects of Electric Current Test - 19

Result

Magnetic Effects of Electric Current Test - 19

Score

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SHARING IS CARING

Question 1

Low power rating

High power rating

Medium power rating

All

Question 2

3

2

1

4

Solution

Question 3

Fleming left hand rule

Fleming right hand rule

Both

None

Solution

Question 4

Principle of force experienced by current carrying conductor in magnetic field

Principle of current experienced by current carrying conductor in magnetic field

Principle of force experienced by current carrying conductor in electric field

None of the above

Solution

Question 5

Green colour

Black colour

Red colour

All

Solution

Question 6

Into the page

Out of the page

Toward the top of the page

Toward the bottom of the page

To the left

Solution

Question 7

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 8

Experience a force when it is in magnetic field

Does not experience a force when it is in magnetic field

Experiences the force only when the field is electromagnetic in nature

None of the above

Solution

Question 9

Red

Brown

Light blue

Green

Solution

Question 10

current in coil

EMF in the coil

frequency in coil

both A and C

Solution

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