Two infinite plane parallel sheets separated by a distance d have equal and opposite uniform charge densities σ. Electric field at a point between the sheets is
|
(a) Zero |
(b) |
|
(c) |
(d) Depends upon the location of the point |
(b) 
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A man can see only between 75 cm and 200 cm. The power of lens to correct the near point will be
|
(a) + 8/3 D |
(b) + 3 D |
(c) – 3 D |
(d) – 8/3 D |
If a number of sine waves with modulation indices n1, n2, n3 ........ modulate a carrier wave, then total modulation index (n) of the wave is
|
(a) n1 + n2 .... + 2(n1 + n2.....) |
(b) |
|
(c) |
(d) None of these |
On increasing the plate separation of a charged condenser, the energy
|
(a) Increases |
(b) Decreases |
(c) Remains unchanged |
(d) Becomes zero |
A non-planar loop of conducting wire carrying a current I is placed as shown in the figure. Each of the straight sections of the loop is of length 2a. The magnetic field due to this loop at the point P (a,0,a) points in the direction
|
(a) |
(b) |
(c) |
(d) |
Watt-hour meter measures
|
(a) Electric energy |
(b) Current |
(c) Voltage |
(d) Power |
