Magnetic Effects of Electric Current Test

Result

Magnetic Effects of Electric Current Test - 14

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Weekly Quiz Competition

Question 1
1 / -0

The wire having a black 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 earth. These colour codes are used to distinguish between live, neutral and earth. which is a standard way of colours coding for electric connections.
Option B
Question 2
1 / -0

Which of the following figures depict non uniform magnetic field?

A

B

C

D
Question 3
1 / -0

A magnetic compass shows a deflection when placed near a current carrying wire. If the current in the wire is increased, How does the deflection of the compass gets affected ?

A
increased

B
decreased

C
remain same

D
data insufficient

Solution

When a magnetic compass is brought close to a current carrying wire there is deflection in the compass due to the formation of magnetic field. The magnetic field lines around a long wire which carries an electric current form concentric circles around the wire. The direction of the magnetic field is perpendicular to the wire.
The deflection increases when the current is increased because the magnitude of the field is directly proportional to the strength of the electric current. That is, stronger the electric current, stronger the magnetic field.
Question 4
1 / -0

A current carrying conductor

A
Experiences a force when it is in magnetic field

B
Does not experience a force when it is in magnetic field

C
Experiences the force only when the field is electromagnetic in nature

D
none of the above

Solution

A current-carrying conductor experience a force when it is in a magnetic field, due to the interaction between the magnetic field & the field (magnetic) produced by moving charges in the wire.
Using Fleming's left hand rule we can determine the direction of the force.
The current-carrying conductor generates a magnetic field around it. This interacts with an external magnetic field. When two magnetic field interacts attraction & repulsion between them based on the direction of external magnetic field and the direction of current in the conductor.
OPTION : A.
Question 5
1 / -0

In the right-hand thumb rule, where does the thumb point to?

A
Direction of current

B
Direction of magnetic field

C
Direction of Earth's magnetic field

D
All of these

Solution

In the right hand thumb rule, the thumb points towards the direction of current while the curled fingers gives the direction of magnetic field.
Question 6
1 / -0

The magnetic lines of force due to straight current carrying conductor are:

A
circular lines

B
straight lines

C
concentric lines

D
elliptical lines

Solution

The magnetic field lines due to a straight current-carrying conducting wire are concentric circles with the wire passing through the center.
Question 7
1 / -0

The wire having a red plastic covering is a

A
live wire

B
neutral wire

C
earth wire

D
none of these

Solution

In household wiring, mainly three coloured wires are used for different purposes.
$$\text{Red Colour} \rightarrow \text{Live wire}$$
$$\text{Green Colour} \rightarrow \text{Earth wire}$$
$$\text{Black Colour} \rightarrow \text{Neutral wire}$$
Question 8
1 / -0

An electron is moving vertically downwards at any place. The direction of magnetic force acting on it due to horizontal component of earth's magnetic field will be

A
towards east

B
towards west

C
towards north

D
towards south

Solution

According to Fleming left hand rule, if the direction of horizontal component of earth's magnetic field is from south to north and direction of velocity of electron is downwards then the direction of the force given by the thumb is towards west.
Question 9
1 / -0

An electron and a proton travel with equal speeds and in the same direction, at $$90^o$$ to a uniform magnetic field. They experience forces which are initially

A
in opposite direction and differ by a factor of about 1840

B
in the same direction and differ by a factor of about 1840

C
equal in magnitude but in opposite directions

D
identical

Solution

As both of the particle having same speed and in the same field at same angle, they will be experiencing same force but in opposite direction as they are opposite in charge.
Question 10
1 / -0

Where the switch is connected in a circuit ?

A
in the ground wire.

B
in the live wire

C
in the neutral wire

D
in live and neutral both.

Solution

A switch opens or closes an electrical circuit. If the circuit is open, no electricity flows. If the circuit is closed, electricity flows through the circuit.
In our homes, we receive the supply of electric power through the main supply (mains), either supported through overhead electric poles or by underground cables. The live wire and neutral wire, coming from the electric pole, enter a box fitted just outside our house which has a main fuse.
The live wire is connected to the switch because the live wire carries a voltage of 220 V and the passage of this voltage can be disabled by switching off the circuit.