A point charge Q resides at the origin. A particle of mass 0.001 kg carries a charge of 3 µC. The particle is released from rest at x = 2 m, and its kinetic energy as it passes x = 0.5 m is 0.36 J. Find the charge Q. The Coulomb constant is 8.98755 × 109 N · m 2 /C 2 . Answer in units of µC.

Suppose a wire with a current is pushed upward by a magnetic field. how would the wire move if the direction of the current reversed? explain your answer.

In the circuit, the switch s has been open for a long time and r = 125 kohm. it is then suddenly closed. (a) determine the time constant before the switch is closed. s (b) determine the time constant after the switch is closed. _ s (c) let the switch be closed at t = 0. find the current in the switch as a function of time. (use t for time. express your answer in milliamps and seconds.) i(t) =_

Petroleum contains energy. a. light b. kinetic c. chemical d. mechanical