Mechanics | Relativity Answers

A scale reads 300 N when a piece of nickel is hanging from it. What does it read (in N) when it is lowered so that the nickel is submerged in water?

_______N

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.

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 -22uC. 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.

The drawing shows a positive point charge +q1, a second point charge q2 that may be positive or negative, and a spot labeled P, all on the same straight line. The distance d between the two charges is the same as the distance between q1 and the spot P. With q2 present, the magnitude of the net electric field at P is twice what it is when q1 is present alone. Given that q1 = +0.30 μC, determine the magnitude |q2| when q2 is
(a) positive and (b) negative

Two charges are placed on the x axis. One of the charges (q1 = +7.86C) 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.

During a particular thunderstorm, the electric potential between a cloud and the ground is Vcloud - Vground = 1.1 x 10^8 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?

Two Spheres of radius 6cms, having charges 10^-8C, -3×10^-8C. Find the potential of 2 spheres and potential at midpoint of centres if the distance between centres is 2m.

how can we explain electric flux.