MCQ
What is the net magnetic flux through a closed surface?
- APositive
- BNegative
- CZero
- DDepends on the nature of the surface
✓
Answer
- Zero
Explanation:
Gauss’s law indicates that there are no sources or sinks of the magnetic field inside a closed surface. A “closed surface” is a surface that completely encloses a volume with no holes. Therefore, the net magnetic flux through a closed surface is zero.
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
A particle of mass m and charge q moves with a constant velocity v along the positive x direction. It enters a region containing a uniform magnetic field B directed along the negative z direction, extending from x = a to x = b. The minimum value of v required so that the particle can just enter the region x > b is
|
(a) qb B/m |
(b) q(b – a) B/m |
(c) qaB/m |
(d) q(b + a)B/2m |
In an endothermic reaction the binding energies of reactants and products are e1, e2 respectively, then:
When a glass rod is rubbed with silk, what kind of charge will be developed on glass?
Identify the correct statement about the charges q1 and q2:
At the time of total solar eclipse, the spectrum of solar radiation would be
|
(a) A large number of dark Fraunhofer lines |
|
(b) A less number of dark Fraunhofer lines |
|
(c) No lines at all |
|
(d) All Fraunhofer lines changed into brilliant colours |
Which of the following theories is the most satisfactory about the origin of the universe
|
(a) Big Bang theory |
(b) Pulsating theory |
(c) Steady state theory |
(d) None of these |
The radioactive nucleus 
decays to 
through the emission of
|
(a) Neutron |
(b) Proton |
(c) Electron |
(d) Positron |
In a photo cell, the photo-electrons emission takes place
|
(a) After 10–1 sec on incident of light rays |
|
(b) After 10–3 sec on incident of light rays |
|
(c) After 10–6 sec on incident of light rays |
|
(d) After 10–8 sec on incident of light rays |
A conducting loop is placed in a uniform magnetic field with its plane perpendicular to the field. An emf is induced in the loop if:
- It is translated.
- It is rotated about its axis.
- It is rotated about a diameter.
- It is deformed.
The value of dielectric strength for air is: