Magnetic Effects of Electric Current Test

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Magnetic Effects of Electric Current Test - 23

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Weekly Quiz Competition

Question 1
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Which of the following statements is correct about the magnetic lines of force inside a current carrying solenoid ?

A
magnetic field lines are along the axis and are parallel to each other

B
magnetic field lines are perpendicular to the axis and equidistant from each other

C
magnetic field lines are circular and they do not intersect each other

D
magnetic field lines are circular at the ends but they are parallel to the axis inside the solenoid.

Solution

The magnetic lines of force inside a current carrying solenoid are along the axis and are parallel to each other. The case is shown in figure.
Question 2
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Which arrangement is used for domestic circuits ?

A
Series

B
Parallel

C
Series and parallel both

D
None
Solution
For Domestic circuits parallel arrangement is always used because:
1. In parallel circuits, if one electrical appliance stop working due to some effect then all other appliances keep working normally.
2. In parallel circuit, each electrical appliance has own switch due to which it can be turn off or on independently, without effecting other appliances.
3. In parallel circuits, each electrical appliance gets same voltage as that of the power supply line.
4. In the parallel connection of electrical appliances, the overall resistance of the house hold circuit is reduced due to which the current from the power supply is high.
Question 3
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A wire is carrying current vertically downwards. To the east of the wire, the magnetic field would be directed to

A
East

B
West

C
Into the plane of the paper

D
Out of the plane of paper

Solution

The current in the wire is in the downward direction. Using the right-hand thumb rule we see that the direction of the magnetic field to the east of the wire is coming out of the plane of paper.
Question 4
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In alternating current

A
The direction of current is always positive

B
The direction of current is always negative

C
The direction of current changes constantly

D
The direction of current is either positive or negative

Solution

C

Electric charge in alternating current (AC) changes direction periodically. The voltage in AC circuits also periodically reverses because the current changes direction.
Question 5
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The wire having a green plastic covering is a:

A
Live wire

B
Neutral wire

C
Earth wire

D
None of these

Solution

During wiring in our houses, we use the traditional concept of using red colour wire as live, black as neutral and green for the earth.
These colour codes are used to distinguish between live, earth and neutral
Question 6
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The magnetic lines of force due to a bar magnet are :

A
Curved lines

B
Curved closed loops

C
Concentric circles

D
Parallel and straight

Solution

It is the property of the force of the magnetic field line that lines of force are closed curves. Which starts in the air from the North pole and ends at the South pole and then returns to the North pole through the interior of the magnet.
Hence, the magnetic lines of force due to a bar magnet are curved close loops lines.
Question 7
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Fleming's left-hand rule is used to find the direction of _______ acting on the current carrying conductor placed in a/an ________ field.

A
Force, Magnetic

B
Force , Electric

C
Torque, Magnetic

D
Torque, Electric

Solution
Question 8
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Magnetic lines of force:

A
Always intersect.

B
Are closed curves.

C
Tend to far away from the poles of a magnet.

D
Do not pass through vacuum.

Solution

Magnetic lines of force are closed curves.
Inside the magnet field lines are directed towards the south pole to the North pole whereas outside the magnet field lines are from the North pole to the South pole.
Question 9
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Various distribution circuits are connected in

A
series

B
parallel

C
series or parallel

D
nothing can be decided

Solution

Parallel circuit configuration limits the amount of power in each circuit and also provides an equal amount of energy to all appliances. If one circuit breaker goes out, power remains on in the rest of the home.
Question 10
1 / -0

A motor converts:

A
mechanical energy into electrical energy

B
mechanical energy into sound energy

C
electrical energy into mechanical energy

D
electrical energy into sound energy

Solution

An electric motor is a device that uses an electric current to turn an axle in circular motion which is mechanical energy.
Hence an electric motor transforms electrical energy into mechanical energy.

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Re-Attempt Weekly Quiz Competition

Magnetic Effects of Electric Current Test - 23

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Magnetic Effects of Electric Current Test - 23

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Question 1

magnetic field lines are along the axis and are parallel to each other

magnetic field lines are perpendicular to the axis and equidistant from each other

magnetic field lines are circular and they do not intersect each other

magnetic field lines are circular at the ends but they are parallel to the axis inside the solenoid.

Solution

Question 2

Series

Parallel

Series and parallel both

None

Solution

Question 3

East

West

Into the plane of the paper

Out of the plane of paper

Solution

Question 4

The direction of current is always positive

The direction of current is always negative

The direction of current changes constantly

The direction of current is either positive or negative

Solution

Question 5

Live wire

Neutral wire

Earth wire

None of these

Solution

Question 6

Curved lines

Curved closed loops

Concentric circles

Parallel and straight

Solution

Question 7

Force, Magnetic

Force , Electric

Torque, Magnetic

Torque, Electric

Solution

Question 8

Always intersect.

Are closed curves.

Tend to far away from the poles of a magnet.

Do not pass through vacuum.

Solution

Question 9

series

parallel

series or parallel

nothing can be decided

Solution

Question 10

mechanical energy into electrical energy

mechanical energy into sound energy

electrical energy into mechanical energy

electrical energy into sound energy

Solution

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