Electromagnetic Induction Test

Result

Electromagnetic Induction Test - 66

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
4 / -1

Two coils A and B having turns 300 and 600 respectively are placed near each other, on passing a current of 3.0 ampere in A, the flux linked with A is 1.2 × 10^–4 weber and with B it is 9.0 × 10^–5 weber. Themutual inductance of the system is

A
2 × 10^–5 henry

B
3 × 10^–5 henry

C
4 × 10^–5 henry

D
6 × 10^–5 henry

Solution
Question 2
4 / -1

An inductor L, a resistance R and two identical bulbs, B₁ and B₂ are connected to a battery through a switch S as shown in the figure. The resistance R is the same as that of the coil that makes L. Which of the following statements gives the correct description of the happenings when the switch S is closed

A
The bulb B₂ lights up earlier than B₁ and finally both the bulbs shine equally bright

B
B₁ light up earlier and finally both the bulbs acquire equal brightness

C
B₂ lights up earlier and finally B₂ shines brighter than B₂

D
B₁ and B₂ light up together with equal brightness all the time
Question 3
4 / -1

An air core solenoid has 1000 turns and is one metre long. Its cross-sectional area is 10 cm². Its self-inductance is

A
0.1256 mH

B
12.56 mH

C
1.256 mH

D
125.6 mH

Solution
Question 4
4 / -1

An inductance L and a resistance R are first connected to a battery. After sometime the battery is disconnectedbut L and R remain connected in a closed circuit. Thenthe current reduces to 37% of its initial value in

A
RL sec

B
R/L sec

C
L/R sec

D
1/LR sec

Solution
Question 5
4 / -1

Why the current does not rise immediately in a circuit containing inductance

A
Because of induced e.m.f.

B
Because of high voltage drop

C
Because of low power consumption

D
Because of Joule heating
Question 6
4 / -1

Two circular coils have their centres at the same point. The mutual inductance between them will be maximum when their axes.

A
Are parallel to each other

B
Are at 60° to each other

C
Are at 45° to each other

D
Are perpendicular to each other
Question 7
4 / -1

In L – R circuit, for the case of increasing current, the magnitude of current can be calculated by using the formula

A
I = I₀e^{–Rt /L}

B
I = I₀(1 – e^{–Rt /L})

C
I = I₀(1 – e^{Rt /L})

D
I = I₀e^{Rt /L}
Question 8
4 / -1

The current through choke coil increases from zero to6 A in 0.3 seconds and an induced e.m.f. of 30 V isproduced. The inductance of the coil of choke is

A
5 H

B
2.5 H

C
1.5 H

D
2 H

Solution
Question 9
4 / -1

The resistance and inductance of series circuit are 5 Ω and 20 H respectively. At the instant of closing the switch, the current is increasing at the rate 4 A/s. Thesupply voltage is

A
20 V

B
80 V

C
120 V

D
100 V

Solution
Question 10
4 / -1

The adjoining figure shows two bulbs B₁ and B₂, resistor R and an inductor L. When the switch S is turned off

A
Both B₁ and B₂ die out promptly

B
Both B₁ and B₂ die out with some delay

C
B₁ dies out promptly but B₂ with some delay

D
B₂ dies out promptly but B₁ with some delay