Electromagnetic Waves — Physics STD 12 Science — Question

What is the net flux of the uniform electric field of Exercise 1.15 through a cube of side 20 cm oriented so that its faces are parallel to the coordinate planes?

Can a battery be charged with alternating current?

Which of the following has the least wavelength? Gamma rays, blue light, infrared radiation and ultraviolet radiation.

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?

Consider a book lying on a table. The weight of the book and the normal force by the table on the book are equal in magnitude and opposite in direction. Is this an example of Newton's third law?

Write the name of the electromagnetic wave that is used to study crystal structure of solids.

The dielectric constant decreases if the temperature is increased. Explain this in terms of polarization of the material.

Can a metal sphere of radius 1 em be given a charge of IC?

Two wires of equal length, one of copper and the other of manganin have the same resistance. Which wire is thicker?