Magnetic Effects Of Current Test

Result

Magnetic Effects Of Current Test - 9

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Question 1
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A current carrying loop is free to turn in a uniform magnetic field. The loop will then come into equilibrium when its plane is inclined at

A
0^∘ to the direction of the field

B
45^∘ to the direction of the field

C
90^∘ to the direction of the field

D
135^∘to the direction of the field

Solution
Question 2
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A 100 turns coil shown in figure carries a current of 2 amp in a magnetic field 0.2 Wb/m². The torque acting on the coil is

A
0.32 Nm tending to ratte the side AD out of the page

B
0.32 Nm tending to ratte the side AD into of the page

C
0.0032 Nm tending to ratte the side AD out of the page

D
0.0032 Nm tending to ratte the side AD into of the page

Solution

The torque experienced by the coil is :

τ = NBiA

= 100 × 0.2 × 2 × (0.08×0.1)

= 0.32N × m

Direction can be found by Fleming's left hand rule
Question 3
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A rectangular coil 20 cm × 20 cm has 100 turns carries a current of 1 A. it is placed in a uniform magnetic field B = 0.5 T with the direction of magnetic field parallel to the plane of the coil. the magnitude of the torque required to hold this coil in this position is

A
Zero

B
200 N−m

C
2 N−m

D
10 N−m

Solution

We know that τ=NBiA

So, τ = 100 × 0.5 × 1 × 400 × 10 − 4 = 2 N−m
Question 4
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A circular loop of area 0.01 m² carrying a current of 10 A, is held perpendicular to a magnetic field of intensity 0.1 T. The torque acting on the loop is

A
0.001 N m

B
0.8 N m

C
zero

D
0.01 N m

Solution
Question 5
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The magnetic moment of a circular coil carrying current is

A
Directly proportional to the length of the wire in the coil

B
Inversely proportional to the length of the wire in the coil

C
Directly proportional to the length of the square of the length of the wire in the coil

D
Inversely proportional to the length of the square of the length of the wire in the coil

Solution
Question 6
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What is shape of magnet in moving coil galvanometer to make the radial magnetic field?

A
Concave

B
Horse shoe magnet

C
Convex

D
None of the above

Solution

The shape of magnet in moving coil galvanometer to make the radial magnetic field is concave magnets.
Question 7
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Current 'i' is carried in a wire of length L. If the wire is turned into circular coil, the maximum magnitude of torque in a given magnetic field B will be

A

B

C

D

Solution

The torque experienced by the wire in the magnetic field is:
Question 8
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In ballistic galvanometer, the frame on which the coil is wound is non-metallic to:

A
Avoid the production of induced emf

B
Avoid the production of eddy currents

C
Increase the production of eddy currents

D
Increase the production of induced emf

Solution

The moving coil galvanometer have their coil wound on a 'metallic (copper or aluminum) frame, so as to make the motion dead beat due to the production of eddy currents. In the ballistic galvanometer, on the other hand, the damping is to be reduced to the minimum and hence the frame is of a non-conducting material eg, paper or bamboo.
Question 9
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A solenoid of length 0.4 m, having 500 turns and 3A current flows through it. A coil of radius 0.01 m and have 10 turns and carries current of 0.4 A has to placed such that its axis is perpendicular to the axis of solenoid ,then torque on coil will be

A
5.92×10⁻⁷N.m

B
5.92×10⁻⁵ N.m

C
5.92×10⁻⁴N.m

D
5.92×10⁻³ N.m

Solution
Question 10
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In a moving coil galvanometer, deflection of the coil is related to the electrical current i by the relation

A
i∝tanθ

B
i∝θ

C
i∝θ²

D
i∝√θ

Solution

Moving coil galvanometer is based on the fact that when a current carrying coil is placed in magnetic field it experiences a torque.

This torque is counter balanced by a spring system and deflection in that spring is proportional to current because it measure the torque which is proportional to the current.

I = kθ/NBA