Magnetic Effects of Electric Current Test

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Magnetic Effects of Electric Current Test - 6

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Question 1
1 / -0

The magnetic field inside a long straight solenoid-carrying current

A
is zero.

B
decreases as we move towards its end.

C
increases as we move towards its end.

D
is the same at all points.

Solution

The magnetic field inside a long straight solenoid-carrying current is the same at all points.

The field lines inside the solenoid are in the form of parallel straight lines. This indicates that the magnetic field is the same at all points inside the solenoid. That is, the field is uniform inside the solenoid.
Question 2
1 / -0

When a current carrying conductor is kept near a magnet it experience a _________

A
force

B
back EMF

C
eddy current

D
none of the above

Solution

An electric current flowing through a conductor produces a magnetic field. The field so produced exerts a force on a magnet placed in the vicinity of the conductor.
Question 3
1 / -0

A current carrying straight conductor is pierced through the center of a rectangular cardboard carrying small iron filling on the top of the board. The iron fillings

A
will align themselves, in a direction parallel to the direction of the flow of current.

B
will align themselves, in a direction opposite to the direction of the flow of current.

C
will remain undisturbed

D
will form a circular pattern around the wire indicating the orientation of the magnetic field.

Solution

When current is allowed to pass through a straight wire, a pattern of concentric circles indicating the field lines of a magnetic field is developed around the wire. The arrows in the circles show the direction of the field lines. The nature of the direction of the magnetic field is a close up of the pattern obtained.
Question 4
1 / -0

By which instrument can the presence of magnetic field be determined?

A
Voltmeter

B
Ammeter

C
Galvanometer

D
Magnetic needle.

Solution

The instrument used to detect the presence of magnetic field is a magnetic needle. In the presence of current the magnetic needle show deflection, which confirms the presence of the magnetic field.

Voltmeter is used to measure the potential drop across any conductor.

In the same way, ammeter is a device that is used to obtain the magnitude of the current flowing in a circuit.

A galvanometer is an electro-mechanical instrument that can be used to measure both voltage and the current in a circuit.
Question 5
1 / -0

if there is a circular coil having n turns, the field produced is

A
n times larger than the field produced by a single coil.

B
1/n times the field produced by a single coil.

C
n² times larger than the field produced by a single coil.

D
none of the above

Solution

We know that 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.
Question 6
1 / -0

A current through a horizontal power line flows in east to west direction. What is the direction of magnetic field at a point directly below it and at a point directly above it?

A
west to east

B
north to south

C
south to north

D
Both B and C

Solution

According to the question the current is flowing in an east to west direction. One of the convenient way to find the direction of the magnetic field is to apply right hand thumb rule to determine the direction of magnetic field.

The current is in the east-west direction. Applying the right-hand thumb rule, we get that the direction of magnetic field at a point below the wire is from north to south. The direction of magnetic field at a point directly above the wire is from south to north.

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Magnetic Effects of Electric Current Test - 6

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Magnetic Effects of Electric Current Test - 6

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Question 1

is zero.

decreases as we move towards its end.

increases as we move towards its end.

is the same at all points.

Solution

Question 2

force

back EMF

eddy current

none of the above

Solution

Question 3

will align themselves, in a direction parallel to the direction of the flow of current.

will align themselves, in a direction opposite to the direction of the flow of current.

will remain undisturbed

will form a circular pattern around the wire indicating the orientation of the magnetic field.

Solution

Question 4

Voltmeter

Ammeter

Galvanometer

Magnetic needle.

Solution

Question 5

n times larger than the field produced by a single coil.

1/n times the field produced by a single coil.

n2 times larger than the field produced by a single coil.

none of the above

Solution

Question 6

west to east

north to south

south to north

Both B and C

Solution

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n² times larger than the field produced by a single coil.