Rest and Motion: Kinematics — Physics STD 12 Science — Question

Answer the following question:
When a low flying aircraft passes overhead, we sometimes notice a slight shaking of the picture on our TV screen. Suggest a possible explanation.

When a dielectric slab is gradually inserted between the plates of an isolated parallel-plate capacitor, the energy of the system decreases. What can you conclude about the force on the slab exerted by the electric field?

Write the value of the electric field due to an electric dipole at a point situated on its axis.

Consider the situation of the previous problem. If the mirror reflects only 64% of the light energy falling on it, what will be the ratio of the maximum to the minimum intensity in the interference pattern observed on the screen?

What is the shape of equipotential surfaces due to the following? (a) Due to point charge (b) Due to uniform electric field.

Can you, have an AG series circuit in which there is. a phase difference of 180° between the emf and the current? 120°?

What is called equipotential surface?Draw the diagram of equipotential surface due point positive charge.

"A microscope and a telescope should have high magnification power as well as adequate resolution power." Explain the meaning of the statement.

When a body is weighed on an ordinary balance we demand that the arm should be horizontal if the weights on the two pans are equal. Suppose equal weights are put on the two pans, the arm is kept at an angle with the horizontal and released. Is the torque of the two weights about the middle point (point of support) zero? Is the total torque zero? If so, why does the arm rotate and finally become horizontal?

What is the length of the telescope in normal adjustment?