If you accumulate a static charge and then touch a wooden frame of a door, you often find no spark or shock, although there would be, you touched the metal handle. Why?

Answer the following :- If you compare the gravitational force on the earth due to the sun to that due to the moon, you would find that the Sun’s pull is greater than the moon’s pull. (you can check this yourself using the data available in the succeeding exercises). However, the tidal effect of the moon’s pull is greater than the tidal effect of sun. Why ?

You are given two metal spheres mounted on protable insultating supports. Find the way use a glass rod rubbed with silk but may not touch it to spheres. Do the spheres have to be of equal size for your method to work?

Following table shows the points of each player scored in four games: Now answer the following questions: To find the mean number of points per game for C, would you divide the total points by 3 or by 4? Why?

When you touch a metal object like a door handle on a dry winter day, you are likely to see a spark and feel a definite shock. We usually explain this by saying that we have built up a static charge. Why does this not happen on a hmid day in the summer?