4 wireless transmission cables used in electronic communication

Erosion of the beach is normally a slow process. however, in certain situations, large chunks of shore may wash out to sea. what could cause this to happen?

Find the magnetic field a distance r from the center of a long wire that has radius a and carries a uniform current per unit area j in the positive z direction.

If the new moon happens on january 15th, what shape will it be on february 6th?