Physics Answers

What is the force on an electron in an electric field of 500 N/C?

A charge of 5 X 10^-6 C experiences a force of 10 N at a certain point in space. What is the electric field intensity?

Four point charges are equally separated by 1.0 m in air with q1= 30 nC, q2 = 4.0 nC, q3 = 2.0 nC, q4 = 5.0 nC. (a) What is the potential at a point halfway between q1 and q2? (b) How much work is needed to bring a 6 nC charge from infinity to this point?

A battery consisting of three identical cells, each with internal resistance of 1.0 Ω is connected in a series with

5.0 Ω and 3.0 Ω resistors. The voltage across the 5 Ω resistor is 5V. Determine the (a) current flowing through the circuit, (b) voltage across the 3 Ω resistor, (C) terminal voltage of the cell, and (d) electromotive force of the cell.

A stationary proton is accelerated through a potential difference of 83.5 kV. What speed did the proton acquire?

Suppose that each headlight of a car uses 3 A and that the driver accidentally left the headlights on. How long will it take for a 12 V battery rated 80 Ah to be fully discharged?

Given three resistors, each having a resistance of 1 Ω, how many different values of equivalent resistance ca be obtained by the different series-parallel combinations if all the three resistors are to be used in the circuit?

A body falls freely from the rest, Find:

A. Distance it falls in 5 sec.

B. Velocity after falling 5 km.

C. Time required to attain a velocity of 50 m/s.

D. Time in which it falls 200 m.

3.The following three charges are arranged as shown. Determine the net force acting on the charge on the far right (q3 = charge 3). q1 = 1.5 x 10^-6C,q2 = - 2.3 x 10^-6C,q3 = -3.5 x 10^-3C.

4.The following charges are placed on the vertices of a right triangle. Charges are the same as that on problem 3.Find the net electrostatic force on charge 1.

1.Two point charges, Q_A = +8 μC and Q_B = -5 μC, are separated by a distance r = 10 cm. What is the magnitude of the electric force? The constant k = 8.988 x 10⁹ Nm²/C

2.Two charged particles Q_P = +10 μC and Q_q = +20 μC are separated by a distance r = 10 cm along the horizontal. What is the magnitude of the electrostatic force?

A light ray strike an air/water surface at an angle of 46 degrees with respect of the normal. find the angle of refraction when the direction of the ray is from the air to water