An electric field of 1500 V / m and a magnetic field of 0.40 weber / meter2 act on a moving electron. The minimum uniform speed along a straight line the electron could have is ____.
1.6 ( 1015 m / s
6 ( 10-16 m / s
3.75 ( 103 m / s
3.75 ( 102 m / s
An electron, moving in a uniform magnetic field of induction of intensity  has its radius directly proportional to ____.
Its charge
Magnetic field
None of the above
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 is horizontal. The induced e.m.f. in the coil would be maximum when ____. 
The plane of the coil is horizontal
The plane of the coil makes an angle of 45° with the magnetic field
The plane of the coil is at right angles to the magnetic field
The plane of the coil makes an angle of 30° with the magnetic field
An electric potential difference is induced between the ends of the conductor shown in the diagram, when the conductor moves in the direction ____. 
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
When a wire loop is rotated in a magnetic field, the direction of induced e.m.f. changes once in each ____.
1 revolution
2 revolution
A conducting wire is moving towards right in a magnetic field B. The direction of induced current in the wire is shown in the figure. The direction of magnetic field ____. 
In the plane of paper pointing towards right
In the plane of paper pointing towards left
Perpendicular to the plane of paper and downwards
Perpendicular to the plane of paper and upwards
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
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
The electron in the beam of a television tube move horizontally from south to north. The vertical component of the earth's magnetic field points down. The electron is deflected towards ____.
No deflection
North to south


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