Magnetic Effects of Electric Current Test

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Magnetic Effects of Electric Current Test - 17

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following defines electromagnetic induction:

A
When the magnetic field associated with a coil changes, an induced electric current flows through the coil.

B
Electric current induces magnetic field near the wire carrying current.

C
Two permanent magnets exert force on each other.

D
Electrolyte disintegrates into ions in a battery.

Solution

The magnetic field associated with a coil is the magnetic flux flowing normally to the surface area of the current-carrying coil. When it changes, an emf is produced opposing the cause. This is the principle of Electromagnetic induction.
Question 2
1 / -0

In the statement of Fleming's left hand rule, what do the direction of centre finger represents

A
motion

B
magnetic field

C
current

D
none

Solution

The direction of the current and that of the magnetic field perpendicular to each other and found that the force is perpendicular to both of them. The three directions can be illustrated through a simple rule, called Flemings left-hand rule. 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 the current, then the thumb will point in the direction of motion or the force acting on the conductor.
Question 3
1 / -0

Magnetic field has

A
Magnitude

B
Direction

C
Both

D
None

Solution

We know that
$$\overset { \rightarrow }{ B } =\dfrac { { \mu }_{ 0 }Il }{ 4\pi { r }^{ 2 } } $$
Thus has magnitude and direction is obtained by different laws as per the direction of current.
Question 4
1 / -0

Potential difference of $$220-250\ V$$ is present between:

A
Earth wire and neutral wire

B
Live wire and earth wire

C
Live wire and neutral wire

D
B and C both

Solution

The potential difference between a live wire and the neutral wire is about $$220\ V-250\ V$$. which is generally provided for household purposes in homes for electricity.
Question 5
1 / -0

Production of electricity from magnetism is called

A
Electric field

B
Magnetic field lines

C
Electromagnetic induction

D
Magnetic induction

Solution

The production of electricity from magnetism is electromagnetic induction. Electric current can produce magnetism and the reverse is also true.
Question 6
1 / -0

Electromagnetic induction is the :

A
charging of a body with a positive charge

B
production of current by relative motion between a magnet and a coil

C
rotation of the coil of an electric motor

D
generation of magnetic field due to a current carrying solenoid

Solution

$$\bullet$$Electromagnetic induction is the production of current by relative motion between a magnet and a coil.
$$\bullet$$The phenomenon of producing electric current in a conductor by moving it perpendicular to a magnetic field or vice -versa, is called electro magnetic induction.
Question 7
1 / -0

In a current carrying conductor, if the direction of magnetic field and that of the current are mutually perpendicular to each other, then the force acting on the conductor will be

A
perpendicular to both

B
perpendicular to direction of current

C
perpendicular to direction of field.

D
none

Solution

A current-carrying conductor, when placed in a magnetic field, experiences a force. If the direction of the field and that of the current are mutually perpendicular to each other, then the force acting on the conductor will be perpendicular to both and will be given by Flemings left-hand rule. This is the basis of an electric motor. An electric motor is a device that converts electric energy into mechanical energy.
Question 8
1 / -0

All appliances in a domestic electric circuit are connected in parallel so that

A
Voltage drop across each appliance is same.

B
Current through each appliance is same.

C
Power consumed by each appliance is same.

D
It allows amplification of power

Solution

Electrical appliances are connected in a parallel arrangement in a house circuit because each appliance gets full voltage as resistance in a parallel arrangement is low. If one appliance fuses, it does not affect the working of other appliances. We can use one appliance without using other appliances.
Question 9
1 / -0

An electric generator actually acts as :

A
Source of electric charge

B
Source of heat energy

C
An electromagnet

D
A converter of energy

Solution

An electric generator is a machine that generates electricity by using the principle of electromagnetic induction. It converts mechanical energy to electrical energy.
Question 10
1 / -0

An electric motor works on the principle:

A
of electromagnetic induction

B
when a rectangular coil is placed in a magnetic field and current is passed through it, a force acts on the coil which rotates it continuously.

C
both A and B

D
None of the above

Solution

An electric motor utilises the magnetic effect of current. It works on the principle that when a rectangular coil is placed in a magnetic field and current is passed through it, a force acts on the coil which rotates it continuously.

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Magnetic Effects of Electric Current Test - 17

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Magnetic Effects of Electric Current Test - 17

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Question 1

When the magnetic field associated with a coil changes, an induced electric current flows through the coil.

Electric current induces magnetic field near the wire carrying current.

Two permanent magnets exert force on each other.

Electrolyte disintegrates into ions in a battery.

Solution

Question 2

motion

magnetic field

current

none

Solution

Question 3

Magnitude

Direction

Both

None

Solution

Question 4

Earth wire and neutral wire

Live wire and earth wire

Live wire and neutral wire

B and C both

Solution

Question 5

Electric field

Magnetic field lines

Electromagnetic induction

Magnetic induction

Solution

Question 6

charging of a body with a positive charge

production of current by relative motion between a magnet and a coil

rotation of the coil of an electric motor

generation of magnetic field due to a current carrying solenoid

Solution

Question 7

perpendicular to both

perpendicular to direction of current

perpendicular to direction of field.

none

Solution

Question 8

Voltage drop across each appliance is same.

Current through each appliance is same.

Power consumed by each appliance is same.

It allows amplification of power

Solution

Question 9

Source of electric charge

Source of heat energy

An electromagnet

A converter of energy

Solution

Question 10

of electromagnetic induction

when a rectangular coil is placed in a magnetic field and current is passed through it, a force acts on the coil which rotates it continuously.

both A and B

None of the above

Solution

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