Electromagnetic Induction  MCQs

MCQs of Electromagnetic Induction

Showing 41 to 50 out of 113 Questions
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41.
The Lenz's force acting on a conducting rod is _____
(a) proportional to its velocity
(b) proportional to the sequence of its velocity
(c) inversely proportional to its velocity
(d) inversely proportional to the square of its velocity
Answer:

Option (a)

42.
Two coils are placed closed to each other. The mutual inductance of the pair of coils depends upon.
(a) the rates at which currents are changing in the two coils.
(b) relative position and orientation of the two coils.
(c) the materials of the wires of the coils
(d) the currents in the two coils
Answer:

Option (b)

43.
An electrical bulb of 100W is connected in parallel with an ideal inductance of 1H. This arrangement is connected to 90 V battery through switch on pressing the switch.
(a) bulb glows.
(b) bulb glows after sometime and then continues to glow
(c) the bulb does not glow
(d) the bulb glows for a short time and then stops glowing.
Answer:

Option (c)

44.
The north pole of horizontal bar magnet is being brought closer to vertical, conducting plane, along perpendicular direction the induced current in the conducting plane is _____
(a) clockwise
(b) anticlockwise
(c) horizontal
(d) vertical
Answer:

Option (b)

45.
When current is increasing in the coil, the direction of induced emf is _____ the direction of current.
(a) same as
(b) normal to
(c) opposite to
(d) none of above
Answer:

Option (c)

46.
The distance between two extreme points of two wings of an Aeroplane is 60 m. It is flying at a speed of 720 km/hr in horizontal direction. If the vertical component of earth's magnetic field at that place is 2 × 10-4 Wb m-2, the induced emf between these two end points is _____ V.
(a) 0.24
(b) 0.024
(c) 2.4
(d) 24
Answer:

Option (c)

47.
A long solenoid has 1000 turns. When a current of 4 A flows through it, the magnetic flux linked with each turns of the solenoid is 4 × 10-3 Wb. The self-inductance of the solenoid is
(a) 3H
(b) 2H
(c) 1H
(d) 4H
Answer:

Option (c)

48.
A metal conductor of length 1 m rotates vertically about one of its ends at angular velocity 5 rad s-1 . If horizontal component of the Earth's magnetic field is 0.2 × 10-4 T, then emf developed between the two ends of the conductor is _____.
(a) 5 mV
(b) 5 μV
(c) 50 mV
(d) 50 μV
Answer:

Option (d)

49.
A jet plane is travelling at a speed of 500 m/s. If Earth’s magnetic field at the location has a magnitude of 5 × 10-4 T and the dip angle is 30°, then potential difference developed between the ends of the wing, 20 m long, is _____.
(a) 2.5 V
(b) 5.0 V
(c) 7.5 V
(d) 10 V
Answer:

Option (a)

50.
An aeroplane with 20 m wing span is flying at 250 ms-1 straight south parallel to the Earth's surface. The Earth’s magnetic field has a horizontal component of √3 × 10-5 T and the dip angle is 60° . The induced emf between the plane tips is _____.
(a) 0.05 V
(b) 0.15 V
(c) 0.35 V
(d) 0.55 V
Answer:

Option (b)

Showing 41 to 50 out of 113 Questions
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