Magnetic Effects of Electric Current Test

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Magnetic Effects of Electric Current Test - 20

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Weekly Quiz Competition

Question 1
1 / -0

When the plane of the rectangular coil is parallel to the direction of the magnetic field in a dynamo, then

A
Induced current will be zero.

B
Induced current is maximum.

C
AC is produced.

D
DC is produced.
Solution
When the rectangular coil is parallel to the direction of the magnetic field, the induced current is zero. It is because, effectively, zero or no magnetic field lines are linked to the cross-section of the coil. Induced voltage/ current can be zero only if:
the number of magnetic field lines linked with the coil doesn't change with time
or there are no magnetic field lines linked to the coil at all.
The change in magnetic field lines can be achieved by:
by relative motion between the magnet and the coil
varying the current in the primary coil which varies the number of magnetic field lines linked with the secondary coil.
If the above two conditions are not met, then also the induced current is zero.
Question 2
1 / -0

The figure showing Fleming's left hand rule is given. Which figure or thumb shows the direction of flow of electric current?

A
First finger

B
Second finger

C
Thumb

D
Small finger

Solution

The direction of force or motion of a current-carrying wire placed in a magnetic field is given by Fleming's left-hand rule. The second finger gives the direction of the electric current.
Question 3
1 / -0

Which of the following is not correct about the magnetic field lines?

A
The magnetic field lines of a magnet form continuous closed loops.

B
The tangent to the field line at a given point represents the direction of the net magnetic field B at that point.

C
The larger the number of field lines crossing per unit area, the stronger is the magnitude of the magnetic field B.

D
The magnetic field lines may intersect to each other in certain conditions.

Solution

The magnetic field lines do not intersect.
Question 4
1 / -0

Which statement is wrong from the following?

A
The earthing wire is green coloured

B
In India, current flowing through wire is AC and its frequency is $$50Hz$$

C
In India, voltage between two wires is $$110V$$

D
T.V., tube light, bulbs are connected with $$5A$$ line

Solution

In India, the voltage between two wires is $$220 V$$. So, C is wrong. All other statements are correct.
Question 5
1 / -0

.................. gave the principle of Electromagnetic Induction.

A
Volta

B
Ampere

C
Faraday

D
Orested
Question 6
1 / -0

Magnetic field lines around straight wire is .....

A
parallel to the wire

B
perpendicular to the wire

C
circular

D
elliptical

Solution

Solution:
The magnetic field lines around a straight wire is in form of concentric circles with its center lying on the wire itself. The direction of these magnetic field lines can be found out using right hand thumb rule.
Answer: Hence magnetic field lines around a straight wire is circular i.e, option C is correct.
Question 7
1 / -0

A coil carries a current in a magnetic field. The coil experiences a turning effect. Which device uses this effect?

A
A d.c motor

B
An electromagnet

C
A relay

D
A transformer

Solution

A simple electric motor can be built using a coil of wire that is free to rotate between two opposite magnetic poles. When an electric current flows through the coil, the coil experiences a force and moves.
So, it must be a d.c. motor.
Question 8
1 / -0

Which device uses slip rings?

A
A d.c electric motor

B
A relay

C
A transformer

D
An a.c. generator

Solution

Slip rings are used in an AC Generator. It is hollow rings that are connected to the ends of the armature coil and it helps to produce Ac current.
Question 9
1 / -0

An $$\alpha $$-particle moves from east to west in a magnetic field perpendicular to the plane of the paper and into the paper. The particle is deflected towards:

A
East

B
West

C
South

D
North

Solution

An $$\alpha$$-particle is a positively charged particle. The direction of current is along the direction of motion of the $$\alpha$$-particle(east to west). The direction of the magnetic field is into the paper. Therefore, by using Fleming’s left-hand rule, the force is directed into the page south. So, the particle will be deflected towards the south.
Question 10
1 / -0

An electron beam is moving from left to right of the observer and magnetic field is acting vertically upwards. The direction of force acting on electron is

A
towards the observer

B
away from the observer

C
downwards

D
upwards

Solution

From Flemings's left hand rule, force on a positive charge moving from left to right and magnetic field being vertically upwards is towards the observer. If the charge is negative (example electron), force acts opposite to this direction i.e. away from the observer.

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Re-Attempt Weekly Quiz Competition

Magnetic Effects of Electric Current Test - 20

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Magnetic Effects of Electric Current Test - 20

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Question 1

Induced current will be zero.

Induced current is maximum.

AC is produced.

DC is produced.

Solution

Question 2

First finger

Second finger

Thumb

Small finger

Solution

Question 3

The magnetic field lines of a magnet form continuous closed loops.

The tangent to the field line at a given point represents the direction of the net magnetic field B at that point.

The larger the number of field lines crossing per unit area, the stronger is the magnitude of the magnetic field B.

The magnetic field lines may intersect to each other in certain conditions.

Solution

Question 4

The earthing wire is green coloured

In India, current flowing through wire is AC and its frequency is $$50Hz$$

In India, voltage between two wires is $$110V$$

T.V., tube light, bulbs are connected with $$5A$$ line

Solution

Question 5

Volta

Ampere

Faraday

Orested

Question 6

parallel to the wire

perpendicular to the wire

circular

elliptical

Solution

Question 7

A d.c motor

An electromagnet

A relay

A transformer

Solution

Question 8

A d.c electric motor

A relay

A transformer

An a.c. generator

Solution

Question 9

East

West

South

North

Solution

Question 10

towards the observer

away from the observer

downwards

upwards

Solution

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