In an oscillating LC circuit, the maximum charge on the capacitor is Q. The charge on the capacitor, when the energy is stored equally between the electric and magnetic field is :
If vg, vx and vm are the speeds of gamma rays, X rays and microwaves respectively in vacuum then :
vg > vm > vx
vg > vx > vm
vg = vm = vx
none of these
n small metal drops of same size are charged to V volt each. If they coalesce to form a single large drop, then its potential will be:
Vn
D.
Volume of big drop = n x volume of small drops
Potential of each small drop
The potential of bigger drop
V' =
A parallel plate air capacitor is charged and then isolated. When a dielectric material is inserted between the plates of the capacitor, then which of the following does not change?
Electric field between the plates
Potential difference across the plates
Charge on the plates
Energy stored in the capacitor
A spherical drop of mercury having a potential of 2.5 V is obtained as a result of merging 125 droplets. The potential of a constituent droplet would be
1.0 V
0.5 V
0.2 V
0.1 V
A person standing in front of a mirror finds his image larger than himself. This implies that the mirror is :
convex
parabolic
plane
concave
For a telescope, larger be the diameter of the objective lens:
greater the resolving power
smaller is the resolving power
greater is the magnifying power
smaller is the magnifying power
If the critical angle for total internal reflection from a medium to vacuum is 30°, the velocity of light in the medium is :
3 × 108 m/s
1.5 × 108 m/s
6 × 108 m/s
× 108 m/s
In single slit diffraction pattern
central fringe has negligible width than others
all fringes are of same width
central fringe does not exist
none of the above