MCQ
Gauss's law is valid for:
- AAny closed surface.
- BOnly regular close surfaces.
- CAny open surface.
- DOnly irregular open surfaces.
✓
Answer
- Any closed surface.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Relativistic corrections become neccssary when the expression for the kinetic energy $\frac{1}{2}\text{mv}^2$, becomes comparable with mc2, where m is the mass of the particle. At what de Broglie wavelength will relativistic corrections become important for an electron?
→An object of height 1.5 cm is placed on the axis of a convex lens of focal length 25 cm. A real image is formed at a distance of 75 cm from the lens. The size of the image will be
|
(a) 4.5 cm |
(b) 3.0 cm |
(c) 0.75 cm |
(d) 0.5 cm |
Two rays A and B being reflected by a mirror and going as A' and B'. The mirror:
- Is plane.
- Is convex.
- Is concave.
- May be any spherical mirror.
An electron and a proton enter region of uniform magnetic field in a direction at right angles to the field with the same kinetic energy. They describe circular paths of radius 
and 
respectively. Then
|
(a) |
|
(b) |
|
(c) |
|
(d) |
The resistance of a galvanometer coil is R. What is the shunt resistance required to convert it into an ammeter of range 4 times
|
(a) |
(b) |
(c) |
(d) 4 R |
The equation 
is
|
(a) b -emission |
(b) a -emission |
(c) e– capture |
(d) Fission |
If the minimum wavelength obtained in an X-ray tube is 2.5 
, the operating potential of the tube will be
|
(a) 2 kV |
(b) 3 kV |
(c) 4 kV |
(d) 5 kV |
Two insulated charged spheres of radii 20 cm and 25 cm respectively and having an equal charge Q are connected by a copper wire, then they are separated
|
(a) Both the spheres will have the same charge Q |
|
(b) Charge on the 20 cm sphere will be greater than that on the 25 cm sphere |
|
(c) Charge on the 25 cm sphere will be greater than that on the 20 cm sphere |
|
(d) Charge on each of the sphere will be 2Q |
Two metal plates having charges Q, -Q face each other at some separation and are dipped into an oil tank. If the oil is pumped out, the electric field between the plates will:
The dimensions of volume charge density is: