How to acheive time dilation

Describe the path of the electric current through a circuit?

An electron and a proton have the same kinetic energy upon entering a region of constant magnetic field and their velocity vectors are perpendicular to the magnetic field. suppose the magnetic field is strong enough to allow the particles to circle in the field. note: you'll need to look up the masses for an electron and proton. 1) what is the ratio of the radii of their circular paths rp/re?

When the force acting on an object points at least partially in the direction of the motion the work done is considered to be negative