Why is a positively charged object made neutral (discharged) by someone touching it?

A positive charge is put in a uniform field as shown. In which of the directions shown will the charge move, after being released?

Which diagram best illustrates the electric field around a positive charge?

Which diagram correctly shows the forces F that act on two charged spheres suspended close to each other?

A student holds a rod in one hand and rubs the rod with a thin sheet of material held in his other hand. Both the rod and the thin sheet become charged and remain charged.

From what could the rod and the thin sheet be made?

There are unknown charges on insulated masses X, Y and Z. Mass X attracts mass z. Mass Y repels mass Z. Which of the following could be the charges on masses X, Y and Z?

Three objects X, Y and Z are metal spheres, each on an insulated stand. Objects X and Y experience a force of attraction. Objects X and Z experience a force of attraction.

Which set of charges cannot be correct?

An electrostatically charged pick up small pieces of paper.

Which of the following will not pick up pieces paper?

Two point charges +1.0 mC and +2.0 mC are situated as shown below. At which point could the resultant electric field

due to their charges be zero?

A stationary negative charge in an electric field experiences an electric force in the direction shown. What is the direction of the electric field?

A piece of polythene is rubbed with a cloth dust The polythene becomes negatively charged and the cloth becomes positively charged. What has happened to the polythene and the cloth to cause this?

A positively charged rod is brought close to an insulated metal sphere. Which diagram best shows the induced charges on the sphere?

The diagram shows electric field lines around two isolated point charges P and Q. Which of the following statements is true?

A positive and a negative charge of equal magnitude are placed a short distance apart. Which diagram best represents the associated electric field?

A positively charged sphere is moved close to an isolated metal cylinder. Which diagram shows the charges induced on the cylinder?

The diagram represents two helium nuclei. They have the same speed, mass and charge. They are moving directly towards each other.

helium nucleus ---> <--- helium nucleus

Which statement is correct?

Which diagram correctly shows the electric field between two charged spheres?

A charged rod is held close to one side ball and the other side is earthed. Which diagram shows the charge distribution?

Four processes are used to charge an isolated metal sphere.

P - The sphere is earthed by touching it

Q - The earth connection is removed from the sphere

R - A charged rod is brought close to the sphere

S - The charged rod is removed

In which order should these processes be carry out to charge the sphere?

first ----> last

A positive charge is at point P as shown. There are 2 points X and Y which X is nearer to P. Which of the following correctly describes the electric field at point Y?

Which diagram shows the electric field pattern between two charged spheres?

Two insulated and uncharged metal spheres X and Y are touching. While a positively charged rod is near X, the spheres are moved apart. After this action, X has a negative charge. What will be the charge on Y?

Two insulated, uncharged metal spheres X and are initially in contact. While a positively-charged rod is near X, the spheres are moved apart. After the action, X has a negative charge. The charge on Y is

A pupil wants to charge a metal ball by induction, using a strip of polythene. She uses the following steps but not in this order.

1) the metal ball is earthed momentarily

2) the polythene strip is brought up to the ball

3) the polythene strip is removed

4) the polythene strip is rubbed with a woollen cloth

To charge the ball correctly, in which order should she carry out the steps?

A charged sphere is suspended by an insulating thread inside a metal can. The outside of the can is earthed. Which diagram shows the resulting charges on the sphere and on the can?

The diagram shows the electric field pattern between two isolated point charges. Which two point charges produce the pattern?

A uniformly positively charged insulator was held by an insulator stand. A hand touched the charged insulator on one side for a few seconds as shown in the diagram. What is the final charge on the insulator?

Two parallel, conducting plates with air between them are placed closed to one another as shown in the diagram below. The top plate is given a negative charge and the bottom one is earthed. Which one of the following correctly describes the charges on the lower plate and the direction of the electric field between them?

Sphere X carries a positive charge and sphere Y carries a negative charge. They are placed a short distance apart and a small positive charge P is placed between them. In which direction does P move, and what is the force between X and Y?

The diagram shows a positively charged rod close to two conducting spheres mounted on insulating stands. The spheres are in contact. The spheres are then separated and finally the charged rod is removed. Which diagram shows the charges on the sphere?

Two metal spheres are mounted on insulating stands. Sphere X is initially uncharged and sphere Y is initially positively charged. A metal rod, held by an insulating handle, is placed in contact with X and Y as shown.