Electromagnetic Induction Test

Result

Electromagnetic Induction Test - 56

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Question 1
4 / -1

A small coil is introduced between the poles of an electromagnet so that its axis coincides with the magnetic field direction. The number of turns is n and the cross-sectional area of the coil is A. When the coil turns through 180° about its diameter, the charge flowing through the coil is Q. The total resistance of the circuit is R. What is the magnitude of the magnetic induction?

A

B

C

D

Solution
Question 2
4 / -1

Two circular coils A and B are facing each other as shown in figure. When the current i through A is altered

A
There will be repulsion between A and B if i is increased

B
There will be attraction between A and B if i is increased

C
There will be neither attraction nor repulsion when i is changed

D
Attraction or repulsion between A and B depends on the direction of current. It does not depend whether the current is increased or decreased
Question 3
4 / -1

A conducting loop having a capacitor is moving outward from the magnetic field then which plate of the capacitor will be positive

A
Plate–A

B
Plate–B

C
Plate–A and Plate–B both

D
None of the above
Question 4
4 / -1

A straight wire of length L is bent into a semicircle. It is moved in a uniform magnetic field with speed v with diameter perpendicular to the field. The induced e.m.f. between the ends of the wire is

A
BLv

B
2BLv

C
2πBLv

D

Solution
Question 5
4 / -1

A
2 H

B
5 H

C
20 H

D
10 H

Solution
Question 6
4 / -1

The magnetic field in the cylindrical region shown in figure increases at a constant rate of 20 mT/sec. Each side of the square loop ABCD has a length of 1 cm and resistance of 4 Ω. Find the current in the wire AB if the switch S is dosed

A
1.25 × 10^–7 A, (anticlockwise)

B
1.25 × 10^–7 A, (clockwise)

C
2.5 × 10^–7 A, (anticlockwise)

D
2.5 × 10^–7 A, (clockwise)

Solution
Question 7
4 / -1

Two coils P and Q are placed co-axially and carry current I and I\'=0 respectively

A
If I' = 0 and P moves towards Q, a current in the same direction as I is induced in Q

B
If I = 0 and Q moves towards P, a current opposite in direction to that of I' is induced in P

C
When I ≠ 0 and I' ≠ 0 are in the same direction, then two coil tend to move apart

D
None of the above

Solution
Question 8
4 / -1

A pair of parallel conducting rails lie at right angles to a uniform magnetic field of 2.0 T as shown in the fig. Two resistors 10 Ω and 5 Ω are to slide without friction along the rail. The distance between the conducting rails is 0.1 m. Then

A

B

C

D

Solution
Question 9
4 / -1

The current through a coil of self-inductance L = 2 mH is given by I = t²e^–t at time t.

A
1 s

B
2 s

C
3 s

D
4 s

Solution
Question 10
4 / -1

A conducting circular loop is placed in a uniform magnetic field 0.04 T with its plane perpendicular to the magnetic field. The radius of the loop starts shrinking at 2 mm/s. The induced e.m.f. in the loop when the radius is 2 cm is

A
3.2 πμV

B
4.8 πμV

C
0.8 πμV

D
1.6 πμV

Solution