A step-up transformer has transformation ratio of 3 : 2. What is the voltage in secondary if voltage in primary is 30 V
| (a) 45 V | (b) 15 V |
(c) 90 V |
(d) 300 V |
Question types
Electromagnetic Induction question types
356 questions across 1 question group — pick any mix to generate a Physics paper with step-by-step answer keys.
356
Questions
1
Question groups
5
Question types
Sample Questions
Electromagnetic Induction questions
One sample from each question group in this chapter. Select any group above to see the full set with answer keys.
A coil having an area 
is placed in a magnetic field which changes from 
to 
in a time interval t. The e.m.f. induced in the coil will be
|
(a) |
(b) |
(c) 
|
(d) 
|
An electron moves along the line AB, which lies in the same plane as a circular loop of conducting wires as shown in the diagram. What will be the direction of current induced if any, in the loop
| (a) No current will be induced |
|
(b) The current will be clockwise |
|
(c) The current will be anticlockwise |
|
(d) The current will change direction as the electron passes by |
Consider the situation shown in the figure. The wire AB is sliding on the fixed rails with a constant velocity. If the wire AB is replaced by semicircular wire, the magnitude of the induced current will
| (a) Increase |
|
(b) Remain the same |
|
(c) Decrease |
|
(d) Increase or decrease depending on whether the semicircle bulges towards the resistance or away from it |
A rectangular coil ABCD is rotated anticlockwise with a uniform angular velocity about the axis shown in diagram below. The axis of rotation of the coil as well as the magnetic field B are horizontal. The induced e.m.f. in the coil would be maximum when
| (a) The plane of the coil is horizontal |
|
(b) The plane of the coil makes an angle of 45° with the magnetic field |
|
(c) The plane of the coil is at right angles to the magnetic field |
|
(d) The plane of the coil makes an angle of 30° with the magnetic field |
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