A certain solenoid (50cm long with 2000 loops) carries a current of 0.7A and is in vacuum . An electron is shot at an angle of 10° to the solenoid axis from a point on the axis , what must be the speed of the electron if it is to just miss hitting the inside of the 1.6cm diameter solenoid.​

Determine the time it takes for a satellite to orbit the earth in a circular "near-earth" orbit. the definition of "near-earth" orbit is one which is at a height above the surface of the earth which is small compared to the radius of the earth, so that you may take the acceleration due to gravity as essentially the same as that on the surface. does your result depend on the mass of the satellite?