The earth act like a strong Magnet, the north Pole of earth’s magnet lies near the geographical south and south pole of earth’s magnet lies near the geographical north. This causes a freely suspended magnet to point towards north south direction. It has been established that earth’s magnetic field is fairly uniform such that its value on the surface is 10-5 Tesla and this field extends up to a height nearly 5 times the radius of earth.
Reasons or Causes of Earth Magnetic Field: Continue reading “Reasons of earth magnetic field”
Q: How the electromagnetic waves are produced?
Ans: We know that a charge at rest produces an electric field around it but no magnetic field where a moving charge produces both electric and magnetic fields but if the charge is moving with constant velocity there will be no charge in the values of the electric and magnetic fields,So all electromagnetic waves are produced.Now if charge is moving with non zero acceleration, both the electric and magnetic field will change, there by producing the em waves. So we conclude that an accelerated charge emits electromagnetic waves. Continue reading “Electromagnetic waves and their features”