Magnetic Effects of Electric Current Test

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Magnetic Effects of Electric Current Test - 38

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Weekly Quiz Competition

Question 1
1 / -0

A long current carrying wire PQ is free to move when placed in a magnetic field B at right angles to the wire, as shown. Then

A
It will move along the magnetic field to the right

B
It will move upwards,towards the observer

C
It will move downwards, away from the observer

D
It will not move at all.

Solution
Question 2
1 / -0

The green colour insulated wires used for:

A
Live wire

B
Neutral wire

C
Earth wire

D
None of these

Solution

(a) Live wire - red colour.
(b) Neutral wire - black colour.
(c) Earth wire - green colour.
The electric power line enters our house through three wires- namely the live wire, the neutral wire and the earth wire.
To avoid confusion between these three wires, we follow different colour code to insulate these wires. This colour coding of wires helps us to connect the switches, plugs and other electrical components through the appropriate wire in the home wiring circuit.

Question 3

1 / -0

Arun suspended a bar magnet on a string as shown in the diagram below. He brought $$3$$ bar-shaped objects $$P,\ Q,$$ and $$R$$ towards the bar magnet. He placed the ends ($$X$$ and $$Y$$) of each object, near the north pole of the bar magnet and recorded his observations in the table below.

Object	$$X $$ brought near to $$N$$ pole	$$Y$$ brought near to $$N$$ pole
$$P$$	N pole repelled	$$N$$ pole attracted
$$Q$$	N pole attracted	$$N$$ pole attracted
$$R$$	N pole stationary	$$N$$ pole remains stationary

Which of the object(s) is/are a magnet?

$$P$$ only

$$R$$ only

$$P$$ and $$R$$

None of these

Solution

A magnet attracts materials like iron, nickel, cobalt. These are called magnetic materials. Materials that are not attracted towards magnets are called non-magnetic. Each magnet has two magnetic poles—North and South. Opposite poles of two magnets attract each other whereas similar poles repel one another.

Object $$P$$ is a magnet. When both the ends are placed near the $$N$$ pole, one pole attracts and the other repels.

Object $$Q$$ is a magnetic material. When both the ends are placed near the $$N$$ pole, both the poles are attracted towards it.

Object $$R$$ is a non-magnet material. When both the ends are placed near the $$N$$ pole, the $$N$$ pole remains stationary.

Question 4
1 / -0

What will happen when three bar magnets are hung in the manner as shown below?

A
Nothing will happen

B
Magnet Y will turn round and round

C
Magnet Y will move towards magnet Z

D
Magnet Y will move towards magnet X.

Solution
Question 5
1 / -0

Two mutually perpendicular conductors carrying currents $$I_1$$ and $$I_2$$ lie in one plane. If $$I_1$$ is taken along x-axis and $$I_2$$ along y-axis, the locus of points where magnetic induction is zero is

A
A straight line passing through origin and having slope $$I_1/I_2$$

B
A straight line passing through origin and having slope- $$I_1/I_2$$

C
A circle

D
A hyperbola

Solution
Question 6
1 / -0

In the given diagrams, compasses are used to plot the magnetic field around a bar magnet with poles marked N(North) and S(South). Which of the following diagrams correctly shows the expected field pattern?

A

B

C

D
Question 7
1 / -0

If you place a compass near a current conducting wire, it will:

A
Get deflected

B
Get charged

C
Get hot

D
Glow brightly

Solution

A metallic wire carrying an electric current has associated with it a magnetic field. A compass needle is a small magnet. If we place a compass near a current conducting wire, it will get deflected.
Question 8
1 / -0

Study the arrangement of three bar magnets as shown below. Which arrangement is possible?

A

B

C

D

Solution

From the arrangements given above only arrangement (C) is possible because it is only this option which is following the basic law of magnetic poles that like poles repel each other while unlike poles attract each other.

We should know the basic properties of a bar magnet also. Some basic properties are listed below:-
(i) Poles are not the real geometric ends of a bar magnet. The shortest distance between two poles is called effective length and is always less than its geometric length.
(ii) A bar magnet attracts small pieces of iron, cobalt, nickel, etc., and other magnetic substances.
(iii) Isolated magnetic poles do not exist. If we break a magnet into two pieces, we get two smaller magnets of similar kinds.
(iv) Like magnetic poles repel, and unlike magnetic poles attract each other this law is known as the law of magnetic poles.
Question 9
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In the given diagram, when the magnet is pushed in to the solenoid, the pointer of the galvanometer defects slightly to the left.
which of the flowing would produce a defection of the pointer towards the right?

A
Move the solenoid towards the magnet.

B
Move the solenoid away from the magnet.

C
Move the magnet faster into the solenoid.

D
By placing the magnet above the coil.

Solution

Relative separation between magnet and solenoid should increase to get a deflection of pointer towards the right. lt is done by moving solenoid away from magnet.
Question 10
1 / -0

A long straight vertical wire carries a current of $$10$$ amperes flowing upwards through it at a place, where the horizontal component of the earth's magnetic field is
$$0.3$$ gauss. Then the total magnetic field at a point 5 cm from the wire due magnetic north of the wire is:

A
$$0.7$$ gauss

B
$$0.5$$ gauss

C
$$0.1$$ gauss

D
$$0.4$$ gauss

Solution