Magnetic Effects of Electric Current Test

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Magnetic Effects of Electric Current Test - 29

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Weekly Quiz Competition

Question 1
1 / -0

Which one of the following statement is not correct about the magnetic field?

A
Inside the magnet the linesgo from north pole to south pole of the magnet

B
Tangents, to the magnetic lines give the direction of the magnetic field

C
The magnetic lines form a closed loop

D
Magnetic lines of force do not cut each other
Question 2
1 / -0

The simplest type of AC voltage or current is the one which

A
Varies exponentially

B
Varies sinusoidally

C
Varies linearly

D
Does not vary uniformly

Solution

Solution:-
AC voltage or current can be of any form, but the simplest type is a sine wave because any periodic wave can be represented as a combination of sine waves.
Option B is correct.
Question 3
1 / -0

The current produced in a closed coil, where magnetic lines of force rapidly change within it is called:

A
direct current

B
alternating current

C
induced current

D
none of these

Solution

The property due to which a changing magnetic field within a closed conducting coil induces electric current in the coil is called electromagnetic induction. The current produced in a closed coil, where magnetic lines of force rapidly change within it is called Induced current.
Question 4
1 / -0

Mark the incorrect statement.

A
The metallic body is connected to the earth wire

B
The earth wire, has insulation of red colour

C
Both

D
None of these

Solution

One of the wires in this supply, usually with red insulation cover, is called live wire (or positive). Another wire, with black insulation, is called neutral wire (or negative). The earth wire has insulation of green colour. It is usually connected to a metal plate deep in the earth near the house. This is used as a safety measure, especially for those appliances that have a metallic body, for example, electric press, toaster, table fan, refrigerator, etc. The metallic body is connected to the earth wire, which provides a low-resistance conducting path for the current.
Question 5
1 / -0

An electron enters a magnetic field at right angles to it. The direction of force acting on the electron will be

A
To the right.

B
To the left.

C
Out of the page.

D
Into the page.

Solution

According to Fleming's Left-Hand rule, the direction of force is perpendicular to the direction of the magnetic field and current. Here, since the direction of current is taken opposite to the direction of motion of electrons, the force is directed into the page.
Question 6
1 / -0

The law of electromagnetic induction has been used in the construction of

A
Generator

B
Electric motor

C
Galvanometer

D
None of these
Question 7
1 / -0

Why the current produced by the generator is called an alternating current?

A
continuous decrease and increase of current occurs.

B
after every half cycle direction of flow of current is reversed.

C
both

D
none

Solution

The current produced by a generator has the following property - after every half cycle, the direction of the flow of current is reversed. The given image depicts the situation correctly.
Because of this reason, the current produced by the generator is also called alternating current.
Question 8
1 / -0

When the coil and the magnet are both stationary

A
there is no deflection in the galvanometer.

B
galvanometer deflects.

C
galvanometer bursts.

D
none

Solution

When the coil and the magnet are both stationary, there is no deflection in the galvanometer. It is, thus, clear from this activity that motion of a magnet with respect to the coil produces an induced potential difference, which sets up an induced electric current in the circuit.
Question 9
1 / -0

The essential difference between an AC generator and a DC generator is that:

A
AC generator has an electromagnet while a DC generator has permanent magnet.

B
DC generator will generate a higher voltage.

C
AC generator will generate a higher voltage.

D
AC generator has slip rings while DC generator has a commutator.

Solution

$$\textbf{Explanation :}$$
$$\textbf{Part1: AC generator}$$
$$\bullet$$Slip rings are used in AC generators.
$$\bullet$$A slip ring is an electromechanical device that permits power and electrical signals to be transmitted from a stationary structure to a revolving structure.
$$\bullet$$Any electromechanical device that requires rotation while sending power or signals can benefit from the usage of a slip ring.
$$\textbf{Part2: DC generator}$$
$$\bullet$$A commutator is used in a DC generator.
$$\bullet$$The act of converting generated alternating current in the armature winding of a DC machine into direct current after passing through the commutator and fixed brushes is known as commutation in DC machines or more particularly commutation in DC generators.
$$\textbf{Option D is correct.}$$
Question 10
1 / -0

The magnetic field inside a current carrying solenoid is:

A
uniform

B
none uniform

C
anticlockwise

D
none

Solution

Magnetic field inside a current carrying solenoid uniform as filed lines are straight and parallel to each other, thus lines representing field is also uniform.

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Re-Attempt Weekly Quiz Competition

Magnetic Effects of Electric Current Test - 29

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Magnetic Effects of Electric Current Test - 29

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Question 1

Inside the magnet the linesgo from north pole to south pole of the magnet

Tangents, to the magnetic lines give the direction of the magnetic field

The magnetic lines form a closed loop

Magnetic lines of force do not cut each other

Question 2

Varies exponentially

Varies sinusoidally

Varies linearly

Does not vary uniformly

Solution

Question 3

direct current

alternating current

induced current

none of these

Solution

Question 4

The metallic body is connected to the earth wire

The earth wire, has insulation of red colour

Both

None of these

Solution

Question 5

To the right.

To the left.

Out of the page.

Into the page.

Solution

Question 6

Generator

Electric motor

Galvanometer

None of these

Question 7

continuous decrease and increase of current occurs.

after every half cycle direction of flow of current is reversed.

both

none

Solution

Question 8

there is no deflection in the galvanometer.

galvanometer deflects.

galvanometer bursts.

none

Solution

Question 9

AC generator has an electromagnet while a DC generator has permanent magnet.

DC generator will generate a higher voltage.

AC generator will generate a higher voltage.

AC generator has slip rings while DC generator has a commutator.

Solution

Question 10

uniform

none uniform

anticlockwise

none

Solution

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