In this electric motor, an electric current causes the coil to rotate changing

Aproton is projected toward a fixed nucleus of charge +ze with velocity vo. initially the two particles are very far apart. when the proton is a distance r from the nucleus its velocity has decreased to 1/2vo. how far from the nucleus will the proton be when its velocity has dropped to 1/4vo?

Sort the images based on whether there's a force of attraction or repulsion between the magnets shown. attraction repulsion

Which of the following is tru about semi-conductors