Magnetic Effects of Electric Current Test

Result

Magnetic Effects of Electric Current Test - 39

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Question 1
1 / -0

Two parallel long wires A and B carry currents $$i_1$$ and $$i_2 ( < i_1)$$. When $$i_1$$ and $$i_2$$ are in same direction, the magnetic field at a point mid-way between the wires is $$10 \mu T$$. if $$i_2$$ is reverse the field becomes $$30\mu T$$ the ratio $$i_1 /i_2$$ is

A
$$1$$

B
$$4$$

C
$$3$$

D
$$2$$

Solution
Question 2
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What is the type of field line of a magnetic field passing through the centre of current carrying circular ring?

A
Circular

B
Straight lines

C
Ellipse

D
Magnetic field is zero at centre

Solution

At the centre of current carrying circular ring, the magnetic field lines are straight.
Question 3
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The phenomenon of electro-magnetic induction is

A
the process of charging a body.

B
the process of generating magnetic field due to a current passing through a coil.

C
producing induced current in a coil due to relative motion between a magnet and the coil.

D
the process of rotating a coil of an electric motor.

Solution

Correct Option: (C)

Explanation for correct answer :
By the name of electromagnetic induction, we can understand that by the relative motion of magnets and the coil, electric current will be induced.
Hence, the correct answer is an option (C)

Explanation for wrong answers :
As we know by the name of the process of charging in this we need to charge something so we can’t get any current from this. Hence, option (A) is the wrong answer.
As electromagnetic induction is the process to produce current but in option (B) we are passing a current. Therefore, option (B) is the wrong answer.
The process of rotating a coil of an electric motor does not produce current instead it needs current to perform such action. Therefore option (D) is the wrong answer.

Therefore, option (A), (B) and (D) are incorrect. The correct answer is option (C).
Question 4
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Magnetic field lines are __________.

A
open curves

B
closed curves

C
Both A & B

D
None of the above

Solution

Magnetic field lines are closed curves and they do not intersect.
Question 5
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Magnetic field has ________.

A
velocity and direction.

B
temperature and direction.

C
magnitude and direction.

D
current and direction.

Solution

Magnetic field has magnitude and direction, and is represented by using the magnetic field lines of force.
Question 6
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The field lines emerge from _______ and merge at ________.

A
east pole, west pole

B
south pole, north pole

C
west pole, east pole

D
north pole, south pole

Solution

The field lines emerge from north pole and merge at south pole.
Question 7
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Electricity flows through a very long solenoid. Some statements are given below related to the magnitude of the magnetic field developed inside the coil. Find out the correct ones and write them down.

A
It is zero

B
It will be the same at all points

C
It gradually decreases towards the ends.

D
It gradually increases towards the ends.

Solution

The field lines inside the solenoid are in the form of parallel straight lines. This indicates that the magnetic field is the same at all points inside the solenoid. That is, the field is uniform inside the solenoid.
Question 8
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Three similar bar magnets are placed from an equilateral as shown in fig ,The magnetic moment of each magnet is M . What is the magnitude of magnetic moment of the system ?

A
M

B
zero

C
2 M

D
M/2

Solution
Question 9
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The direction of magnetic field in a bar magnet is

A
South pole to north pole

B
North pole to south pole

C
South pole to east pole

D
North pole to west pole

Solution

By convention, the field direction is taken to be outward from the North pole and into the South pole of the magnet. Permanent magnets can be made from ferromagnetic materials.
Question 10
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The magnetic field is strongest at

A
the middle of the magnet

B
the north pole

C
the south pole

D
both the poles.