Recent content by jijopaul

For how much length the electric field of a unit charge exist? Light reaches from sun to Earth after traveling that much distance. You mean to say that the electric field of the sun extends up to the distances where its light can reach?

I've heard that em wave consists of mutually perpendicular electric & magnetic oscillations. Imagine that I've a unit charge at any point in space. Associated with this charge, there exists an electric field which diminishes with distance from the charge. If we set forth an oscillation in this...

I completed my degree in mechanical engineering. But I've got a passion in studying physics. And I'm thinking to study it at home. But i don't know where to start and how to go on. I' not thinking like 'commercial' physics degree. I just need to understand quantum mechanics, relativity etc...

I'm going to make it myself. I haven't got any experience in making telescopes. Refracting is prefered

what will be the configurations for a simple 80x telescope? i need to optimize it to the maximum resolution.

Thank you all..

I'm a fresher in PF. If I'm posting indecently, please forgive.. Vacuum is something empty. It contains nothing. Then why should it have properties like permeability, permittivity etc.?