Electromagnetic Induction Test

Result

Electromagnetic Induction Test - 37

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Question 1
4 / -1

The mutual inductance between a primary and secondary circuits is 0.5 H. The resistances of the primary and the secondary circuits are 20 ohms and 5 ohms respectively. To generate a current of 0.4 A in the secondary, current in the primary must be changed at the rate of

A
4.0 A/s

B
16.0 A/s

C
1.6 A/s

D
8.0 A/s

Solution
Question 2
4 / -1

The square root of the product of inductance and capacitance has the dimension of

A
Length

B
Mass

C
Time

D
No dimension

Solution
Question 3
4 / -1

If the current is halved in a coil, then the energy stored is how much times the previous value?

A

B

C
2

D
4

Solution
Question 4
4 / -1

An inductor of inductance L = 400 mH and resistors of resistances R₁ = 2 Ω and R₂ = 2 Ω are connected to a battery of e.m.f. 12 V as shown in the figure. The internal resistance of the battery is negligible. The switch S is closed at t = 0. The potential drop across L as a function of time is

A

B

C

D

Solution
Question 5
4 / -1

A coil of inductance 300 mH and resistance 2 Ω is connected to a source of voltage 2V. The current reaches half of its steady state value in

A
0.15 s

B
0.3 s

C
0.05 s

D
0.1 s

Solution
Question 6
4 / -1

Which of the following is a wrong statement?

A
An e.m.f. can be induced between the ends of a straight conductor by moving it through a uniform magnetic field

B
The self-induced e.m.f. produced by changing current in a coil always tends to decrease the current

C
Inserting an iron core in a coil increases its coefficient of self-induction

D
According to Lenz's law, the direction of the induced current is such that it opposes the flux change that causes it
Question 7
4 / -1

A coil has an inductance of 2.5 H and a resistance of 0.5 r. If the coil is suddenly connected across a 6.0 volt battery, then the time required for the current to rise 0.63 of its final value is

A
3.5 sec

B
4.0 sec

C
4.5 sec

D
5.0 sec

Solution
Question 8
4 / -1

When the number of turns and the length of the solenoid are doubled keeping the area of cross-section same, the inductance

A
Remains the same

B
Is halved

C
Is doubled

D
Becomes four times

Solution
Question 9
4 / -1

The mutual inductance of an induction coil is 5H. In the primary coil, the current reduces from 5A to zero in 10^–3 s. What is the induced e.m.f. in the secondary coil?

A
2500 V

B
25000 V

C
2510 V

D
Zero

Solution
Question 10
4 / -1

The self-inductance of a straight conductor is

A
Zero

B
Very large

C
Infinity

D
Very small

Solution