Apoint charge is used to determine the electric field around a charged particle. why is it necessary that the point charge does not affect the position of the charge being tested? the amount of charge will increase if the charged particle moves closer to the point charge, so any change in position changes the field. the amount of charge will decrease if the charged particle moves closer to the point charge, so any change in position changes the field. electric fields are inversely proportional to the square of the distance, so any change in position changes the field. electric fields are directly proportional to distance, so any change in position changes the field.

Explanation :

An electric field is the space around the charge in which the charge feels the electrostatic force.

A point charge is used to determine the electric field around a charged particle.

Electric field is given by:

Electric fields are inversely proportional to the square of the distance, so any change in position changes the field.

c) up is the direction the magnetic force is acting on the charge.

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

                                              ⇒      

here   k is the proportionality constant whose value is 1.

                                                            [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.