The path executed by a charged particle whose motion is perpendicular to magnetic field i
|
(a) A straight line |
(b) An ellipse |
(c) A circle |
(d) A helix |
(c) A circle
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Two spheres of radius a and b respectively are charged and joined by a wire. The ratio of electric field of the spheres is
|
(a) a/b |
(b) b/a |
(c) |
(d) |
The bluish colour of water in deep sea is due to:
Two charge + q and -q are situated at a certain distance. At the point exactly midway between them
|
(a) Electric field and potential both are zero |
|
(b) Electric field is zero but potential is not zero |
|
(c) Electric field is not zero but potential is zero |
|
(d) Neither electric field nor potential is zero |
The cause of the potential barrier in a P-N diode is
|
(a) Depletion of positive charges near the junction |
|
(b) Concentration of positive charges near the junction |
|
(c) Depletion of negative charges near the junction |
|
(d) Concentration of positive and negative charges near the junction |
When a certain length of wire is turned into one circular loop, the magnetic induction at the centre of coil due to some current flowing is 
If the same wire is turned into three loops to make a circular coil, the magnetic induction at the center of this coil for the same current will be
|
(a) |
(b) 9 |
(c) 3 |
(d) 27 |
In a charged capacitor, the energy resides
|
(a) The positive charges |
(b) Both the positive and negative charges |
|
(c) The field between the plates |
(d) Around the edge of the capacitor plates |
What is increased in step-down transformer
|
(a) Voltage |
(b) Current |
(c) Power |
(d) Current density |
