Magnetic Effects of Electric Current Test

Result

Magnetic Effects of Electric Current Test - 26

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Question 1
1 / -0

Of the following figure, the lines of magnetic induction due to a magnet $$SN$$, are given by :

A
$$1$$

B
$$2$$

C
$$3$$

D
$$4$$

Solution

Magnetic lines of force try to contract, and simultaneously don't intersect with other lines. Magnetic lines of force are always closed loops. Inside a magnet tiny diploes are alligned to give longer field lines . at sides, their orientation is similar but aren't as coulped with other dipoles as center ones.
Question 2
1 / -0

Which part has maximum attraction in a magnet ?

A
In the centre

B
On the sides

C
On the poles

D
On the surface

Solution

Answer is C.

The magnetic field lines near the center are parallel to the length of the bar. Moreover, the density of the field lines is maximized at the "poles" of the bar magnet and minimized at the center which means that the magnitude of the magnetic field is smallest at the center. That is, in the middle the magnetic lines are far away from one another and at the poles are close to each other that is why at the center the magnetic force is less than the poles.
Hence, the maximum attraction is at the poles.
Question 3
1 / -0

A soft iron bar is enclosed by a coil of insulated copper wire as shown in figure. When the plug of the key is closed, the face B of the iron bar marked as:

A
N-pole

B
S-pole

C
N-pole if current is large

D
S-pole if current is small

Solution

For a solenoid,if we imagine gripping the solenoid with your right hand so that your curl fingers follow the direction of the current then your thumb will point towards the north end of the electromagnet.
So,as the current around the face B of the loop is in clockwise direction it develops north polarity.
Question 4
1 / -0

On the basis of following features identify the correct option
I. They always start from north pole and end at the south pole of the magnet outside the magnet.
II. They never intersect each other.

A
Electric lines of force

B
Magnetic lines of force

C
Both (1) and (2)

D
Neither (1) nor (2)

Solution

Properties of magnetic lines of force
(i) they always start from north pole and end at the south pole of the magnet outside the magnet.
(ii) they never intersect each other.
Question 5
1 / -0

Household electrical appliances are joined using .......... combination of resistors.

A
Parallel

B
Alternating

C
Continuous

D
Series

Solution

Household electrical appliances are always joined in parallel.
Electrical appliances are connected in a parallel arrangement in a house circuit because: Each appliance gets full voltage as resistance in a parallel arrangement is low. If one appliance fuses, it does not affect the working of other appliances. We can use one appliance without using other appliances.
Question 6
1 / -0

Study involving both electricity and magnetism is called ______.

A
electromagnetism

B
magnetoelectricism

C
electricmagnetism

D
magneticelectromerism

Solution

Study of phenomenon involving both electricity and magnetism is called electromagnetism.
Question 7
1 / -0

The figure shows a circuit containing a coil wound over a long and hollow thin tube. Copy the diagram and show the polarity required by each face of the solenoid.

A
Current enters the solenoid from face $$B$$, hence this end of solenoid is south pole and the face $$A$$ is north pole.

B
Current enters the solenoid from face $$B$$, hence this end of solenoid is north pole and the face $$A$$ is south pole.

C
Current enters the solenoid from face $$A$$, hence this end of solenoid is south pole and the face $$B$$ is north pole.

D
None of these

Solution

The polarity of the faces of the coil depends on the direction of current and is obtained by a rule known as "The Clock Rule".
According to this rule "When an observer, looking at the face of the coil, finds the current to be flowing in the anti-clockwise direction, then the face of the coil will behave like the north pole. While if the current is in the clockwise direction, the face of the coil will behave like South Pole.
Hence, the face B behaves like South Pole and face A behaves like North Pole.
Question 8
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When a solenoid that is carrying current is freely suspended it comes to rest along a particular direction. Why does this happen ?

A
Because it is suspended in air

B
Because it aligns itself along Earth's magnetic field

C
Because current is passing through it

D
Because it is a coil

Solution

A current carrying solenoid behaves like a bar magnet. When it is suspended freely, it interacts with the Earth's magnetic field and aligns itself along the north-south direction.
Question 9
1 / -0

What is the relationship between an electric current and a magnetic field?

A
An electric current creates magnetic field

B
A changing magnetic field induce an electric current

C
Both $$A$$ and $$B$$

D
None of these

Solution

From magnetic effect of current we know that an electric current create magnetic field.And from electromagnetic induction we know that a changing magnetic field produces an electric current.Hence both A and B are correct.
Question 10
1 / -0

A wire is placed between the poles of two fixed bar magnets as shown. A small current in the wire is into the plane of the paper. The direction of the magnetic force on the wire is

A
$$\uparrow$$

B
$$\downarrow$$

C
$$\rightarrow$$

D
$$\leftarrow$$

E
$$\odot$$ out of the plane of the paper.

Solution