Magnetic Effects of Electric Current Test

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Magnetic Effects of Electric Current Test - 37

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Question 1
1 / -0

Magnetic lines of force due to a bar magnet do not intersect because

A
A point always has a single net magnetic field

B
The lines have similar charges and so repel each other

C
The lines always diverge from a single point

D
None of these

Solution

Magnetic lines of force due to a bar magnet do not intersect because a point always has a single net magnetic field.
Question 2
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With the help of which law the direction of magnetic field due to current carrying conductor be decided?

A
Faraday's law

B
Fleming's right hand rule

C
Right hand thumb rule

D
Fleming's left hand rule

Solution

The direction of magnetic field due to a current carrying conductor can be decided using the Right hand thumb rule. It states that if you point your thumb in the direction of current, then the direction of curl of your fingers gives the direction of the magnetic field.
Question 3
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The direction of magnetic field lines in a region outside the bar magnet are ......................................

A
from the $$N$$ pole towards the $$S$$ pole of a magnet

B
from the $$S$$ pole towards the $$N$$ pole of a magnet

C
in the direction coming out from both the poles of magnet

D
in the direction entering in both the poles of magnet

Solution

A. From the $$N$$ pole towards the $$S$$ pole of a magnet.
Question 4
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What is the field line of a magnetic field passing through the centre of current carrying circular ring?

A
Circular

B
Straight line

C
Ellipse

D
Magnetic field is zero at centre

Solution

B. Straight line
At the centre of current carrying circular ring, the magnetic field lines are straight.
Question 5
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The magnetic field produced in a straight conducting wire on passing the current through it is _______.

A
In the direction of current

B
In the direction opposite to the current

C
Circular around the wire

D
None of these

Solution

The magnetic field lines around a straight current carrying conducting wires are concentric circles whose centres lie on the wire. The direction the magnetic field lines can be determined by right-hand thumb rule.
Question 6
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According to right hand thumb rule, whose direction is indicated by a thumb?

A
Electric current

B
Magnetic field

C
Magnetic force

D
Motion of a conductor

Solution

A. Electric current
Definition of right hand thumb rule: If we hold the wire in right hand in such a way that the thumb points towards the direction of current then the curled fingers on the wire gives the direction of magnetic field.
Question 7
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Which of the following statements is false?

A
The direction of magnitude of magnetic field line is from $$N$$ to $$S$$

B
In the region where the magnetic field lines are at a close distance from each other, there will be a strong magnetic field.

C
The magnetic field lines from close loops.

D
The magnetic field lines can cross each other.

Solution

D. The magnetic field lines can cross each other.
If the magnetic field lines cross each other, it would mean that magnetic field has two directions at that point, which is not possible. Hence, magnetic field lines can cross each other.
Question 8
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Which of the following correctly describes the magnetic field near a long straight wire?

A
The field consists of straight lines perpendicular to the wire.

B
The field consists of straight lines parallel to the wire.

C
The field consists of radial lines originating from the wire.

D
The field consists of concentric circles centred on the wire..

Solution

Hint: In a magnetic field, a moving charge experiences a force that is perpendicular to both its own velocity and the magnetic field.

Correct Answer: Option D

Explanation of Correct Answer:
$$\bullet$$A long straight wire's magnetic field lines are made up of concentric circles centred on the wire. The right hand thumb rule determines the direction of magnetic field lines.
So, the correct answer is option (D).

Explanation of Incorrect Options:
$$\bullet$$The magnetic field will dissipate at half distance between the two wires if there is a perpendicular wire with the same current but in the opposite direction, as shown by the Right hand thumb rule, since each wire will generate a magnetic field of equal strength but in opposing directions. So, Option (A) is incorrect.
$$\bullet$$When a charged particle moves parallel to a magnetic field, it experiences no magnetic force. So, option (B) is incorrect.
$$\bullet$$The magnetic field lines created around a straight current-carrying wire are concentric circles, according to the right hand thumb rule. So, option (C) is incorrect.

Therefore, Option (A), (B) and (C) are incorrect. The correct answer is option (D).
Question 9
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The device used for producing electric current is called a

A
generator

B
galvanometer

C
ammeter

D
motor

Solution

Correct Answer: Option (A)

Explanation for Correct Option:
A generator is a device which converts a mechanical form of energy into electrical energy. The principle of generator is based on electromagnetic induction.
Therefore, the correct answer is option (A)

Explanation for wrong options:
Galvanometer is used as voltmeter or ammeter to find voltage and current respectively. So option (B) and option (C) are incorrect.
Motor have different applications and it does not produce electric current instead it use electric current to run. So option(D) is also wrong.

Therefore, option (B), (C) and (D) are wrong. The Correct answer is Option : (A)
Question 10
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Electromagnetic induction is

A
Charging a substance.

B
Process of developing a magnetic field around a coil by passing electricity through a coil

C
Process of rotating the armature of a generator

D
Process of making electricity by the relative motion of a magnet or a coiled conductor.

Solution

Hint: The creation of an electromotive force across an electrical conductor in a changing magnetic field is known as electromagnetic induction.

Correct answer: Option D

Explanation of correct answer:
When a coil is moved close to a magnet and a relative motion between the two is generated by moving either the magnet or the coil, the magnetic flux connections via the coil change. An emf and, as a result, an electric current flow through the coil as a result of the change in magnetic flux.
Therefore, the correct answer is option (D).

Explanation of Incorrect Options:
During the charging by induction procedure, the charged particle is held near an uncharged conductive substance grounded on a neutrally charged material. There is no relative motion between the magnet and the coiled conductor. So, Option (A) is incorrect.
current must flow when a changing magnetic field passes through a wire coil. Due to the fact that the magnetic field remains constant. So, Option (B) is incorrect.
The process of rotating the armature of a generator counteracts the induction cause.. So, Option (c) is incorrect.

Therefore, option (A), option (B) and option (C) are incorrect. The correct answer is option (D).

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Magnetic Effects of Electric Current Test - 37

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Question 1

A point always has a single net magnetic field

The lines have similar charges and so repel each other

The lines always diverge from a single point

None of these

Solution

Question 2

Faraday's law

Fleming's right hand rule

Right hand thumb rule

Fleming's left hand rule

Solution

Question 3

from the $$N$$ pole towards the $$S$$ pole of a magnet

from the $$S$$ pole towards the $$N$$ pole of a magnet

in the direction coming out from both the poles of magnet

in the direction entering in both the poles of magnet

Solution

Question 4

Circular

Straight line

Ellipse

Magnetic field is zero at centre

Solution

Question 5

In the direction of current

In the direction opposite to the current

Circular around the wire

None of these

Solution

Question 6

Electric current

Magnetic field

Magnetic force

Motion of a conductor

Solution

Question 7

The direction of magnitude of magnetic field line is from $$N$$ to $$S$$

In the region where the magnetic field lines are at a close distance from each other, there will be a strong magnetic field.

The magnetic field lines from close loops.

The magnetic field lines can cross each other.

Solution

Question 8

The field consists of straight lines perpendicular to the wire.

The field consists of straight lines parallel to the wire.

The field consists of radial lines originating from the wire.

The field consists of concentric circles centred on the wire..

Solution

Question 9

generator

galvanometer

ammeter

motor

Solution

Question 10

Charging a substance.

Process of developing a magnetic field around a coil by passing electricity through a coil

Process of rotating the armature of a generator

Process of making electricity by the relative motion of a magnet or a coiled conductor.

Solution

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