Electromagnetic Induction Test

Result

Electromagnetic Induction Test - 28

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Question 1
4 / -1

As shown in the figure, a magnet is moved with a fast speed towards a coil at rest. Due to this induced electromotive force, induced current and induced charge in the coil is E, I and Q respectively. If the speed of the magnet is doubled, the incorrect statement is

A
E increases

B
I increases

C
Q remains same

D
Q increases
Question 2
4 / -1

A coil having 500 square loops each of side 10 cm is placed normal to a magnetic flux which increases at the rate of 1.0 tesla/second. The induced e.m.f. in volts is

A
0.1

B
0.5

C
1

D
5

Solution
Question 3
4 / -1

When a magnet is pushed in and out of a circular coil C connected to a very sensitive galvanometer G as shown in the adjoining diagram with a frequency v, then

A
Constant deflection is observed in the galvanometer

B
Visible small oscillations will be observed in the galvanometer if v is about 50 Hz.

C
Oscillations in the deflection will be observed clearly if v =1 or 2 Hz

D
No variation in the deflection will be seen if v =1 or 2 Hz
Question 4
4 / -1

Three very large plates of same area are kept parallel and close to each other. They are considered as ideal black surfaces and have very high thermal conductivity. The first and third plates are maintained at temperatures 2T and 3T respectively. the temperature of the middle (Le., second) plate understeady state condition is

A

B

C

D

Solution
Question 5
4 / -1

A 50 turns circular coil has a radius of 3 cm, it is kept in a magnetic field acting normal to the area of the coil. The magnetic field B increased from 0.10 tesla to 0.35 tesla in 2 milliseconds. The average induced e.m.f. in the coils is

A
1.77 volts

B
17.7 volts

C
177 volts

D
0.177 volts

Solution
Question 6
4 / -1

A coil having an area 2m² is placed in a magnetic field which changes from 1 Wb/m² to 4 Wb/m² in an interval of 2 second. The e.m.f. induced in the coil will be

A
4 V

B
3 V

C
1.5 V

D
2 V

Solution
Question 7
4 / -1

Two different loops are concentric and lie in the same plane. The current in the outer loop is clockwise and increasing with time. The induced current in the inner loop then, is

A
Clockwise

B
Zero

C
Counter clockwise

D
In a direction that depends on the ratio of the loop radii
Question 8
4 / -1

According to Faraday\'s law of electromagnetic induction

A
The direction of induced current is such that it opposes the cause producing it

B
The magnitude of induced e.m.f. produced in a coil is directly proportional to the rate of change of magnetic flux

C
The direction of induced e.m.f. is such that it opposes the cause producing it

D
None of the above
Question 9
4 / -1

A

B

C

D

Solution
Question 10
4 / -1

The magnetic field in a coil of 100 turns and 40 square cm area is increased from 1 tesla to 6 tesla in 2 second. The magnetic field is perpendicular to the coil. The e.m.f. generated in it is

A
10⁴ V

B
1.2 V

C
1.0 V

D
10^–2 V

Solution