Magnetic Effects of Electric Current Test

Result

Magnetic Effects of Electric Current Test - 36

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following is correct representation of magnetic lines of force ?

A

B

C

D
None of the above

Solution

The lines of magnetic field from a bar magnet form closed lines. By convention, the field direction is taken to be outward from the north pole and in to the south pole of the magnet. Inside a bar magnet its from south to north pole.

Hence option A is correct.
Question 2
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The diagram shows the magnetic field around two bar magnets. Which diagram shows the poles of the magnets?

A

B

C

D

Solution

It is clear that the magnetic line of force starts from N-pole and ends at S-pole.
The diagram in option (C) is correct representation of magnetic line of force.
Question 3
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Choose the incorrect statement.

A
Alternating current is oscillatory

B
Electric power is transmitted over long distances using alternating current.

C
Frequency of alternating current in India is 50 Hz.

D
Alternating current can be used for electrolysis of copper chloride.

Solution

Even if it were current-limited, alternating current (AC) would not be appropriate for electrolysis. Because the "cathode" and "anode" will be constantly switching places as the polarities will change with time. Therefore, direct current (DC) is used for electrolysis.
Question 4
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A current wire produces :

A
an electric field

B
a magnetic field

C
both electric and magnetic fields

D
neither electric nor magnetic field

Solution

Whenever current is passed through a conductor it develops magnetic field around it , in case wire the magnetic field is circular around it and is given by right hand thumb rule .
Question 5
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The phenomenon of electromagnetic induction is :

A
the process of charging a body

B
the process of generating a magnetic field dur to current passing through a coil.

C
producing induced current in a coil by relative motion between a magnet and a coil.

D
the process of rotating a coil of an electric motor.

Solution

When there is relative motion between a magnet and a closed loop there is formation of induced emf due to change in magnetic flux linked with the coil. More the speed more the induced emf.
Question 6
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A bar magnet is immersed in a heap of iron filings and pulled out. The amount of iron filing clinging to the

A
North Pole is almost equal to the South Pole.

B
North Pole is much more than the South Pole.

C
North Pole is much less than the South Pole.

D
Magnet will be same all along its length.

Solution

The correct answer is option (A) North Pole is almost equal to the South Pole.
Question 7
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In an electric motor the energy transformation is:

A
from electrical to chemical

B
from chemical to light

C
from mechanical to electrical

D
from electrical to mechanical

Solution

In an electric motor. the energy transformation is from electrical to mechanical.
Note: An electric motor is a device which converts electrical energy into mechanical energy.
Question 8
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Two magnetic lines of force due to a bar magnet

A
Intersect at the neutral point

B
Intersect near the poles of the magnet

C
Intersect on the equatorial axis of the magnet

D
Do not intersect at all

Solution

The two magnetic lines of force due to a bar magnet do not intersect each other because, at the point of intersection, the compass needle would point towards two directions, which is not possible.
Question 9
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A magnet is placed in iron powder and then taken out, then maximum iron powder is at

A
Some away from north pole

B
Some away from south pole

C
The middle of the magnet

D
The end of the magnet

Solution

A magnet is placed in iron powder and then taken out, then maximum iron powder is at the end of the magnet. It is because the strength of the magnetic field is maximum at the poles (ends) of the magnet.
Question 10
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Which of the statement given below correctly describes the magnetic field near a long, straight current-carrying conductor?

A
The magnetic lines of force are in a plane, perpendicular to the conductor in the form of straight lines.

B
The magnetic lines of force are parallel to the conductor on all the sides of the conductor.

C
The magnetic lines of force are perpendicular to the conductor going radially outward.

D
The magnetic lines of force are in concentric circles with the wire as the center, in a plane perpendicular to the conductor.

Solution

The direction of the magnetic field caused by a long straight current-carrying wire can be found out using the right-hand thumb rule.
It will be concentric around the current-carrying conductor and in a plane perpendicular to it. [option (d) is correct].