Magnetism and Matter Test 0

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Magnetism and Matter Test 0

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Question 1
1 / -0

Field lines are shown close together where the

A
magnetic field is far apart

B
magnetic fields is zero

C
magnetic fields is greater

D
all

Solution

Field lines are used to represent a magnetic field a field line is the path along which a hypothetical free north pole would tend to move. The direction of the magnetic field at a point is given by the direction that a north pole placed at that point would take. Field lines are shown closer together where the magnetic field is greater.
Question 2
1 / -0

_______ exists in the region surrounding a magnet, in which force of the magnet can be detected.

A
Electric field

B
Magnetic field

C
both

D
none

Solution

Magnet has some limited region where the magnetic field lines,representation of magnetism is felt.
Though magnetism has a extent to a large distance but the region where its effect is felt is termed as magnetic field.
Question 3
1 / -0

Properties of magnetic lines of force are:

A
The imaginary lines which represent the direction of magnetic field, are known as magnetic lines of force.

B
Magnetic lines of force are closed curves.

C
Outside the magnet their direction is from north pole to south pole and inside the magnet these are from south to north pole.

D
All

Solution

Properties of magnetic lines of force are:
The imaginary lines which represent the direction of magnetic field, are known as magnetic lines of force. Magnetic lines of force are closed curves. Outside the magnet their direction is from north pole to south pole and inside the magnet these are from south to north pole.They neither have origin nor end. These lines do not intersect, because if they do so then it would mean two value of magnetic field at a single point, which is not possible. At the poles of the magnet the magnetic field is stronger because the lines of force there are crowded together and away from the poles the magnetic field is weak.
Question 4
1 / -0

A magnetic field line is used to find the direction of:

A
south-north

B
a bar magnet

C
a compass needle

D
magnetic field

Solution

The magnetic field lines due to a straight wire carrying a current are concentric circles whose centres lie on the wire. Magnetic field lines are used to find direction of magnetic field.
Question 5
1 / -0

The direction of the induced current in the coil can also be found by

A
lenz's law

B
dynamo rule

C
generator rule

D
none

Solution

The direction of the induced current in the coil can also be found by lenz's law which states that the direction of induced correct is such that it the opposes the change producing it.
Question 6
1 / -0

Who discovered the magnetic effect of electric current?

A
Oersted

B
Newton

C
Einstein

D
Maxwell

Solution

Oersted's law is the law that a steady electric current creates a magnetic field around it. This was discovered on April 21, 1820, by Danish physicist Hans Christian Oersted(1777–1851), when he noticed that the needle of a compass next to a wire carrying current turned.
Question 7
1 / -0

Mark the incorrect statement.

A
The direction of the magnetic field is taken to be the direction in which a north pole of the compass needle moves inside it.

B
The magnetic field lines are closed curves.

C
No two field-lines are found to cross each other.

D
None

Solution

The direction of the magnetic field is taken to be the direction in which a north pole of the compass needle moves inside it. Therefore it is taken by convention that the field lines emerge from the north pole and merge at the south pole. Inside the magnet, the direction of field lines is from its south pole to its north pole. Thus the magnetic field lines are closed curves. The relative strength of the magnetic field is shown by the degree of closeness of the field lines. The field is stronger, that is, the force acting on the pole of another magnet placed is greater where the field lines are crowded. No two field-lines are found to cross each other. If they did, it would mean that at the point of intersection, the compass needle would point towards two directions, which is not possible.
Question 8
1 / -0

When a straight wire is moved up and down rapidly between two poles of a horseshoe magnet then _______ is produced in the wire.

A
magnetic field

B
magnetic current

C
electric current

D
none

Solution

An electric current is produced in the wire. The production of electricity from magnetism is called electromagnetic induction
Question 9
1 / -0

For diamagnetic materials, magnetic susceptibility is

A
Small and negative

B
Small and positive

C
Large and negative

D
Large and positive

Solution

Diamagnetic materials create an induced magnetic field in a direction opposite to an external applied magnetic field and are repelled by applied magnetic field.
Magnetic permeability of the diamagnetic materials is little less than unity.
$$\therefore$$ $$\mu_r = (1 + \chi_m) <1$$
$$\implies$$ $$\chi_m <0$$
Thus magnetic susceptibility of diamagnetic materials is very small and negative.
For example : For Silicon, $$\chi_m = $$ $$- 4.2 \times 10^{-6}$$
Question 10
1 / -0

Magnetic field can be defined as the:

A
space surrounding the magnet in which magnetic force acts

B
space surrounding the magnet in which electric force acts

C
space surrounding the magnet in which no force acts

D
none

Solution

A magnetic field is generated when electric charge carriers such as electrons move through space or within an electrical conductor. It is the space surrounding the magnet in which magnetic force acts. Its intensity is represented by magnetic lines of force.

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Re-Attempt Weekly Quiz Competition

Magnetism and Matter Test 0

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Magnetism and Matter Test 0

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SHARING IS CARING

Question 1

magnetic field is far apart

magnetic fields is zero

magnetic fields is greater

all

Solution

Question 2

Electric field

Magnetic field

both

none

Solution

Question 3

The imaginary lines which represent the direction of magnetic field, are known as magnetic lines of force.

Magnetic lines of force are closed curves.

Outside the magnet their direction is from north pole to south pole and inside the magnet these are from south to north pole.

All

Solution

Question 4

south-north

a bar magnet

a compass needle

magnetic field

Solution

Question 5

lenz's law

dynamo rule

generator rule

none

Solution

Question 6

Oersted

Newton

Einstein

Maxwell

Solution

Question 7

The direction of the magnetic field is taken to be the direction in which a north pole of the compass needle moves inside it.

The magnetic field lines are closed curves.

No two field-lines are found to cross each other.

None

Solution

Question 8

magnetic field

magnetic current

electric current

none

Solution

Question 9

Small and negative

Small and positive

Large and negative

Large and positive

Solution

Question 10

space surrounding the magnet in which magnetic force acts

space surrounding the magnet in which electric force acts

space surrounding the magnet in which no force acts

none

Solution

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