Magnetic Effects of Electric Current Test

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Magnetic Effects of Electric Current Test - 40

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Question 1
1 / -0

What is a Magnetic Field?

A
A space around the magnet where its force can be experienced.

B
A space where magnets are found.

C
Both A & B

D
None of the above

Solution

The magnet exerts its influence in the region surrounding it. For example, the iron filings poured around a bar magnet experience a force. The force thus exerted makes iron filings to arrange in a pattern. The region surrounding a magnet, in which the force of the magnet can be detected, is said to have a magnetic field. The lines along which the iron filings align themselves represent magnetic field lines.
Question 2
1 / -0

If a bar magnet is cut into 'n' pieces, how many poles will each magnet have?

A
1

B
2

C
0

D
n

Solution

No matter how many times you cut a bar magnet, each magnet will have 2 poles i.e. north and south pole.
Question 3
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The diagram shows a bar magnet surrounded by four plotting compasses.
Which is the North Pole?

A
X

B
A

C
Y

D
B

Solution

When a magnetic compass is kept in the magnetic field the direction compass needle shows the direction of the magnetic field.
In the above image, Compass near the X - end shows the outward direction of magnetic field and the Compass near the Y - end shows inward direction of magnetic field. Hence X end will show the North pole of the magnet and Y end will show the North pole of the magnetic field.
Option A.
Question 4
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Take a cardboard and sprinkle some salt and iron filings on it. How will you separate these two?

A
Shake the cardboard

B
Use a bar magnet

C
Blow them

D
All of the above.

Solution

When using a bar magnet the iron filings will stick onto it and will easily be separated.
Question 5
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The region around a magnet, in which the force of magnet can be detected, is called as ________.

A
electric current

B
poles

C
magnetic field

D
electromagnetism

Solution

The region around a magnet, in which the force of magnet can be detected, is called as magnetic field.
Question 6
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Take a cardboard and sprinkle some iron fillings on it. Bring a bar magnet close to the iron fillings. What do you observe?

A
Iron filings stick only on the north pole of a bar magnet

B
Iron filings stick only on the south pole of a bar magnet

C
Iron filings align themselves along the field lines.

D
None of the above.

Solution

You will observe that the iron filings tend to attract towards the magnet and Iron filings align themselves along the field lines.
Question 7
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The flow of current in a circular wire creates a magnetic field at its centre. How can the existence of this field be detected?

A
battery

B
solenoid

C
right hand thumb rule

D
magnetic compass needle

Solution

The existence of this field can be detected by using a magnetic compass needle at the centre of circular wire and the needle will align itself along the axis of loop.
Question 8
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If the number of turns in a current-carrying circular loop is decreased by $$10$$ times, then how will the magnetic field change?

A
Increase by $$10$$ times

B
Increase by $$5$$ times

C
Decrease by $$10$$ times.

D
Decrease by $$5$$ times

Solution

The magnetic field produced by a current-carrying wire at a given point depends directly on the current passing through it. Therefore, if there is a circular coil having $$n$$ turns, the field produced is $$n$$ times as large as that produced by a single turn. This is because the current in each circular turn has the same direction and the field due to each turn then just adds up.

If the number of turns in a current-carrying circular loop is decreased by $$10$$ times, then the magnetic field will decrease by $$10$$ times.
Question 9
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As we move towards the outer edge of the circular loop, the magnetic field lines appear to be _________.

A
Converging

B
Diverging

C
Straight

D
Elliptical

Solution

As we move towards the outer edge of the circular loop, the magnetic field lines appear to be diverging.
Question 10
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Where is the magnetic field strongest in a circular loop?

A
On the circumference

B
At the centre

C
Outside the loop

D
Everywhere on the loop

Solution

The magnetic field produced by a current-carrying straight wire depends inversely on the distance from it. Similarly at every point of a current-carrying circular loop, the concentric circles representing the magnetic field around it would become larger and larger as we move away from the wire. At the center of the circular loop, the arcs of these big circles would appear as straight lines. Every point on the wire carrying current would give rise to the magnetic field appearing as straight lines at the center of the loop.