Mechanics | Relativity Answers

Two point charges are fixed on the y axis: a negative point charge q1 = -27 μC at y1 = +0.21 m and a positive point charge q2 at y2 = +0.37 m. A third point charge q = +8.8 μC is fixed at the origin. The net electrostatic force exerted on the charge q by the other two charges has a magnitude of 25 N and points in the +y direction. Determine the magnitude of q2.

Two particles, with identical positive charges and a separation of 2.83 × 10^-2 m, are released from rest. Immediately after the release, particle 1 has an acceleration a1 whose magnitude is 5.56 × 10^3 m/s2, while particle 2 has an acceleration a2 whose magnitude is 11.7 × 10^3 m/s2. Particle 1 has a mass of 8.95 × 10^-6 kg. Find (a) the charge on each particle and (b) the mass of particle 2.

A 4.8 μC point charge is placed in an external uniform electric field that has a magnitude of 72000 N/C. At what distance from the charge is the net electric field zero?

A tiny ball (mass = 0.010 kg) carries a charge of -22 uC. What is the electric field magnitude that would cause the ball to float above the ground?

A small object has a mass of 3.0 × 10^-3 kg and a charge of -37C. It is placed at a certain spot where there is an electric field. When released, the object experiences an acceleration of 3.4 × 10^3 m/s2 in the direction of the +x axis. Determine the electric field, including sign, relative to the +x axis.

Two charges are placed on the x axis. One of the charges (q1 = +7.86 uC) is at x1 = +3.00 cm and the other (q2 = -22.3C) is at x2 = +9.00 cm. Find the net electric field (magnitude and direction given as a plus or minus sign) at (a) x = 0 cm and (b) x = +6.00 cm.

Vcloud - Vground = 1.1 x 108 V, with the cloud being at the higher potential. What is the change in an electron's potential energy when the electron moves from the ground to the cloud?

A particle with a charge of -2.2 μC and a mass of 3.3 x 10^-6 kg is released from rest at point A and accelerates toward point B, arriving there with a speed of 63 m/s. The only force acting on the particle is the electric force. What is the potential difference VB - VA between A and B? If VB is greater than VA, then give the answer as a positive number. If VB is less than VA, then give the answer as a negative number.

In a television picture tube, electrons strike the screen after being accelerated from rest through a potential difference of 33000 V. The speeds of the electrons are quite large, and for accurate calculations of the speeds, the effects of special relativity must be taken into account. Ignoring such effects, find the electron speed just before the electron strikes the screen.