Induced EMF and Current NEET Questions

Physics - Electromagnetic Induction and Alternating Currents

Induced EMF and Current MCQ Questions


7.
A closed coil is placed in a uniform magnetic field. When the field is suddenly turned off, the induced current in the coil will:
A.
Flow in the direction that maintains the original flux
B.
Flow only at the instant of switching
C.
Flow in the direction opposite to the original flux
D.
Not flow
😑 View Answer Rough Work Error
ANSWER :
A. Flow in the direction that maintains the original flux
8.
Two coils A and B are placed close to each other. When current in A increases, the direction of induced current in B is such that it:
A.
Flows in a direction perpendicular to current in A
B.
Flows in the same direction as current in A
C.
Flows in the direction opposing the increase of current in A
D.
Does not flow
😑 View Answer Rough Work Error
ANSWER :
C. Flows in the direction opposing the increase of current in A
9.
A rectangular loop is being pulled out of a uniform magnetic field region (field directed into the page) with velocity v. The induced current in the loop flows:
A.
Clockwise
B.
No current flows
C.
Sometimes clockwise, sometimes counter-clockwise
D.
Counter-clockwise
😑 View Answer Rough Work Error
ANSWER :
A. Clockwise
10.
A conducting ring is placed with its plane perpendicular to a uniform magnetic field that decreases with time. The induced current in the ring will be such that:
A.
It produces no magnetic field
B.
It reverses direction periodically
C.
It creates a magnetic field supporting the existing one
D.
It creates a magnetic field opposing the existing one
😑 View Answer Rough Work Error
ANSWER :
C. It creates a magnetic field supporting the existing one
11.
A straight conductor of length L moves with velocity v perpendicular to a uniform magnetic field B. The emf induced across its ends is:
A.
BL/v
B.
B²Lv
C.
BL²v
D.
BLv
😑 View Answer Rough Work Error
ANSWER :
D. BLv
12.
A horizontal straight wire 10 m long extending from east to west is falling with a speed of 5.0 m/s at right angles to the horizontal component of earth's magnetic field (0.30 × 10⁻⁴ Wb/m²). The instantaneous emf induced in the wire is:
A.
3 × 10⁻³ V
B.
1.5 × 10⁻³ V
C.
1.5 × 10⁻⁴ V
D.
1.5 V
😑 View Answer Rough Work Error
ANSWER :
B. 1.5 × 10⁻³ V