Electromagnetic Induction Test

Result

Electromagnetic Induction Test - 47

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Weekly Quiz Competition

Question 1
4 / -1

A coil of wire having finite inductance and resistance has a conducting ring placed coaxially within it. The coil is connected to a battery at time t = 0, so that a time-dependent current I₁ (t) starts flowing through the coil. If I₂(t) is the current induced in the ring and B(t) is the magnetic field at the axis of the coil due to I₁ (t), then as a function of time (t > 0), the product I₂(t) B(t)

A
Increases with time

B
Decreases with time

C
Does not vary with time

D
Passes through a maximum

Solution
Question 2
4 / -1

Two circular coils can be arranged in any of the three situations shown in the figure. Their mutual inductance will be

A
Maximum in situation (A)

B
Maximum in situation (B)

C
Maximum in situation (C)

D
The same in all situations
Question 3
4 / -1

A metallic square loop ABCD is moving in its own plane with velocity v in a uniform magnetic field perpendicular to its plane as shown in the figure. An electric field is induced

A
In AD, but not in BC

B
In BC, but not in AD

C
Neither in AD nor in BC

D
In both AD and BC
Question 4
4 / -1

A

B

C

D
Zero

Solution
Question 5
4 / -1

As shown in the figure, P and Q are two coaxial conducting loops separated by some distance. When the switch S is closed, a clockwise current I_p flows in P (as seen by E) and an induced current I_Q₁ flows in Q.
The switch remains closed for a long time. When S is opened, a current I_Q₂ flows in Q. Then the directions of I_Q₁ and I_Q₂ (as seen by E) are

A
Respectively clockwise and anticlockwise

B
Both clockwise

C
Both anticlockwise

D
Respectively anticlockwise and clockwise

Solution
Question 6
4 / -1

A short-circuited coil is placed in a time-varying magnetic field. Electrical power is dissipated due to the current induced in the coil. If the number of turns were to be quadrupled and the wire radius halved, the electrical power dissipated would be

A
Halved

B
The same

C
Doubled

D
Quadrupled

Solution
Question 7
4 / -1

A physicist works in a laboratory where the magnetic field is 2T. She wears a necklace enclosing area 0.01 m² in such a way that the plane of the necklace is normal to the field and is having a resistance R = 0.01 Ω. Because of power failure, the field decays to 1T in time 10^–3 seconds. Then what is the total heat produced in her necklace? (T = tesla)

A
10 J

B
20 J

C
30 J

D
40 J

Solution
Question 8
4 / -1

A coil of inductance 8.4 mH and resistance 6 Ω is connected to a 12 V battery. The current in the coil is 1.0 A in the time (approx.)

A
500 sec

B
20 sec

C
35 milli sec

D
1 milli sec

Solution
Question 9
4 / -1

As shown in the figure a metal rod makes contact and completes the circuit. The circuit is perpendicular to the magnetic field with B = 0.15 tesla. If the resistance is 3 Ω force needed to move the rod as indicated with a constant speed of 2m / sec is

A
3.75 × 10^–3 N

B
3.75 × 10^–2 N

C
3.75 × 10² N

D
3.75 × 10^–4 N

Solution
Question 10
4 / -1

Two identical coaxial circular loops carry current i each circulating in the clockwise direction. If the loops are approaching each other, then

A
Current in each loop increases

B
Current in each loop remains the same

C
Current in each loop decreases

D
Current in one-loop increases and in the other it decreases