If a voltage is put over the circuit, the capacitor is charged and current passes through the resistor. The value is the time constant. The emf source is switched on at t=0. A) After how much time is the capacitor C charged to 75% of its full capacity? B) what is the maximum current through...

30 Two point charges q and q are separated by a distance a. At a point a/3 from q and along the line joining the two charges the potential is zero. (Assume the potential is zero very far from all charges.) (a) Which of the following statements is true?

0 = 8.85 A positive 1.0 C charge is located at the origin and a -0.3 C charge is located at x = 2.0 cm. What is the force on the negative charge?

Which of the systems below has the most potential energy stored in its spring(s), relative to the relaxed position?

Given the definitions of field line directions, if the North pole of a compass points North, which end of the Earth is the North pole of the Earth"s internal magnet?

It causes some domains to grow, others to shrink And the steel develops magnetic polarization If you touch the north pole of a permanent magnet to one end of a steel paper clip, the clips other end will become magnetic. What pole will that other end have?

The force on a charged particle created by its motion in a magnetic field is maximum at what angle between the particle velocity and field?

The magnitude of the magnetic field midway between them is 40 T. If one of the currents then has its direction reversed, what is the resulting magnitude of the magnetic field midway between them? A. a value greater than 40 T b. 40 T c. a value less than 40 T d. 0 T e. It could be any value.

The week of the exam my father, who is also a professor and was visiting UMass on sabbatical, and I went to Target and Wal-Mart to purchase as many clipboards as they had. The students managed the best they could and persevered. I think we owe it to our students to provide physical surroundings...

1 Throwing a 3 kg hand grenade off a platform 40 m off the ground, with vx = 10m/s. Two seconds later a 2 kg piece hits the ground 10 m from the base of the platform. Where is the 1 kg piece at that time? Remember that Momentum is a Vector! A car (m=1000kg, v =40m/s) collides at right angles...