Presentation on theme: "Which is the correct expression for work done in moving a particle of charge q from a to b against an electric field, when the particle is not accelerated?"— Presentation transcript:
Which is the correct expression for work done in moving a particle of charge q from a to b against an electric field, when the particle is not accelerated? a b q
(a) All of them(b) 2, 3 & 4 (c) 1, 2 & 4(d) 1, 3 & 4 (e) 2 & 4 Which of the equations given below are correct?
A negative charge -Q is placed on a conducting sphere. 2. At which of the points a, b, or c is the electrical potential the highest? (a) a(b) b(c) c 1. At which of the points a, b, or c is the electrical potential the lowest? (a) a(b) b(c) c -Q a b c
A positive charge +Q and a negative charge –q are separated by a distance d, and the potential V P = 0 at point P. This means that: a)No force is acting on a test charge placed at point P. b)The electric field must be zero at point P. c)The net work in bringing Q to a distance d from q is zero. d)The net work needed to bring a charge from infinity to point P is zero. -q +Q d P
Which two points shown in the diagram are at the same potential? a)1 and 3 b)2 and 3 c)1 and 4 d)2 and Which of the points shown in the diagram is at the highest potential? a)1 b)2 c)3 d)4
The electric potential at a distance r from the center of a spherical charge of radius R and charge Q is given by the equation on the right. (a) to the rightb) to the left (c) neither: energy is a scalar 1. The zero potential is taken at (a) the center of the sphere (b) the surface of the sphere (c) infinite distance from the sphere 2. A charge q is brought towards a spherical charge Q, as shown below. The direction of the potential energy of charge q is: +Q r
A positive q is moved to within a distance r 1 from charge Q 1 and r 2 from charge Q 2 The potential energy of q (relative to zero at infinity) is:
The potential difference between the cathode and the screen of a traditional TV is 12 kV. What is the speed of an electron just before it hits the screen?
Three positive charges q 1, q 2, q 3 are arranged as shown on the right, where F i is the force on charge q i, and r ij is the distance between charges i and j. The total potential energy of the system is (a) (b) (c) (d) Can't tell without knowing the angles.