Field Theory Answers

an electric deipole consists of points charges q1 = +12 nC and q2 = -12nC placed 10 cm apart compute the electric potentials at a point a,b and c

Calculate the magnitude and direction of the electric field 0.45 m from a +7.85 x 10–9 C point charge.

How far apart are two charges , one of magnitude is 3 uC and the other magnitude is 5uC if the force between them is 20N

A block of mass 4kg is on the point of slipping down a plane inclined at an angle of 30° to the horizontal.What force parallel to the plane will just move it up the plane?

A body of 85kg moving with velocity of 9ms-¹ hits a stationary body of mass 60kg. If the two bodirs stick together after collision, calculate the magnitude of the velocity with whicj they move.

What is the magnitude of the electric field at a field point 2m from a point charge of 4nC

A cannonball is fired horizontally at 23.40 m/s from the edge of a 55 m building.

Determine the:

(a) height of the cannonball from the ground after 2 s.

(b) time taken by the cannonball to reach the ground.

(c) distance from the base of the building to the point where the its landed

a car start from rest after 5 sec and accelerate uniformly for 10 sec before attaining a speed of 20 m/s. if it maintain this speed for the next 5 sec : draw a sketch graph to describe the journey ,use the sketch diagram to determine the uniform of acceleration. the total distance covered ,the average velocity.

A car is traveling at a speed of 33 m/s. (a) What is its speed in kilometers per hour? (b) Is it exceeding the 90 km/h speed limit?

Each of the respective electric fields at a point P due to charges 𝑄1 and 𝑄2 are as follows:

𝑄1 is E1 = 20i + 50j -30k N/C

𝑄2 is E2 = -20i - 60j +30k N/C

If a point charged body A having a charge 𝑄3 = 2C and mass m = 2 kg is placed at point P,

calculate:

a) The electric force acting on the point charged body, neglecting gravity?

b) If gravity is considered as g = 10j 𝑚/𝑠𝑒𝑐

2

, calculate the initial acceleration of the point

charged body A when placed at point P?