# PHYSICS : REVISION TEST ON TOPICS OF CLASS XII ---IV

An electric potential difference is induced between the ends of the conductor shown in the diagram, when the conductor moves in the direction ____. 
P
Q
L
M
A rod of length 20 cm is rotating with angular speed of 100 rps in a magnetic field of strength 0.5 T about it’s one end. What is the potential difference between two ends of the rod ____.
2.28 V
4.28 V
6.28 V
2.5 V
The current carrying wire and the rod AB are in the same plane. The rod moves parallel to the wire with a velocity v. Which one of the following statements is true about induced emf in the rod ____. 
End A is at lower potential with respect to B
A and B is at the same potential
There is no induced e.m.f. in the rod
Potential at A is higher than that at B
Two rails of a railway track insulated from each other and the ground are connected to a milli voltmeter. What is the reading of voltmeter, when a train travels with a speed of 180 km/hr along the track? Given that the vertical component of earth's magnetic field is  and the rails are separated by 1 metre?
1 volt
A coil of N turns and mean cross-stional area A is rotating with uniform angular velocity ( about an axis at right angle to uniform magnetic field B. The induced e.m.f. E in the coil is ____.
NBA sin(t
NB ( sin(t
NB/A sin(t
NBA ( sin(t
A straight conductor of length 0.4 m is moved with a speed of 7 m/s perpendicular to the magnetic field of intensity of 0.9 Wb/m2. The induced e.m.f. across the conductor is ____.
7.25 V
3.75 V
1.25 V
2.52 V
The magnetic induction in the region between the pole faces of an electromagnet is 0.7 weber/m2. The induced e.m.f. in a straight conductor 10 cm long, perpendicular to B and moving perpendicular both to magnetic induction and its own length with a velocity 2 m/s is ____.
0.08 V
0.14 V
0.35 V
0.07 V
A conducting wire is dropped along east-west direction, then ____.
No emf is induced
No induced current flows
Induced current flows from west to east
Induced current flows from east to west
A metal rod moves at a constant velocity in a direction perpendicular to its length. A constant uniform magnetic field exists in space in a direction perpendicular to the rod as well as its velocity. Select the correct statement(s) from the following ____.
The entire rod is at the same electric potential
There is an electric field in the rod
The electric potential is highest at the centre of the rod and decreases towards its ends
The electric potential is lowest at the centre of the rod and increases towards its ends
A two metre wire is moving with a velocity of 1 m/s perpendicular to a magnetic field of 0.5 weber/m2. The e.m.f. induced in it is ____.
0.5 volt
0.1 volt
1 volt
2 volt
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TOPICS: ELECTROMAGNETIC INDUCTION

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Thank you very much. I am glad that you found them useful

4172 days 21 hours 26 minutes ago

great work madam. your tests are very useful. Thanks!

4191 days 11 hours 55 minutes ago

Kajal Sengupta
Physics 9th to 12 th grade,CIE, Edexcel, AP, IB , CBSE, ICSE
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