Electrostatic Potential and Capacitance — Physics STD 12 Science — Question

There are two coils A and B as shown in the figure. A current starts flowing in B as shown, when A is moved towards B and stops when A stops moving. The current in A is counter clockwise. B is kept stationary when A moves. We can infer that

The ratio of kinetic energy to the total energy of an electron in a Bohr orbit of the hydrogen atom is:

A hot liquid is kept in a big room. Its temperature is plotted as a function of time. Which of the following curves may represent the plot?

At sun rise or sunset, the sun looks more red than at mid-day because(a) The sun is hottest at these times(b) Of the scattering of light(c) Of the effects of refraction(d) Of the effects of diffraction

An attractive force of 9N acts between +5C and −5C at some distance. These charges are allowed to touch each other and are then again placed at their initial position. The force acting between them will be:

A microscope is focused on a mark. Then a glass slab of refractive index 1.5 and thickness 6 cm is placed on the mark. To get the mark again in focus the microscope should be moved

Inside a uniform spherical shell:

1. The gravitational potential is zero.
2. The gravitational field is zero.
3. The gravitational potential is same everywhere.
4. The gravitational field is same everywhere.