2024 6091 Static Electricity

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?

• A
• B
• C
• D

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

• negative and smaller than the charge on X
• negative and the same size as the charge on X.
• positive and smaller than the charge on X
• positive and the same size as the charge on X

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

• horizontally to the left
• horizontally to the right
• vertically downwards
• vertically upwards

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?

• rod - copper, thin sheet - silk cloth
• rod - glass, thin sheet - aluminium foil
• rod - iron, thin sheet - paper handkerchief
• rod - nylon, thin sheet - woollen duster

Sphere X has a positive charge and metal sphere Y is uncharged. X is moved close to Y but the spheres do not touch. Y is then earthed by touching it with a wire which is then removed. X is then moved far away from Y. What is the final charge distribution on Y?

• negative all over the surface
• negative on the left and positive on the right
• positive all over the surface
• positive on the left and negative on the right

An isolated metal conductor X is uncharged. Another isolated metal conductor Y, which is positively charged, is moved towards X as shown. What happens as Y is brought close to X?

• Positive charges move from Y to X.
• Some positive charges on X move to the left and some negative charges on X move to the right.
• Some negative charges on X move to the right, but the positive charges on Y do not move.
• Some positive charges on X move to the left, but the negative charges on X do not move.

A negatively charged rod is placed close to an earthed metal sphere Q. The earth connection is removed and then the rod is removed. Which statement is correct?

• Q is negatively charged because negative charges have moved to Q
• Q is negatively charged because positive charges have left Q
• Q is positively charged because negative charges have left Q
• Q is positively charged because positive charges have moved to Q

Which diagram shows the electric field between a positive point charge and a negative point charge?

• A
• B
• C
• D

A teacher has two identical plastic pens. They are both rubbed with identical cloths. The first pen is balanced on an insulated support, as shown. The balanced pen rotates when the cloth or the second pen are held near it. Which statement is correct?

• Both the cloth and the second pen attract the balanced pen.
• Both the cloth and the second pen repel the balanced pen
• The cloth attracts the balanced pen and the second pen repels the balanced pen.
• The cloth repels the balanced pen and the second pen attracts the balanced pen.

A negatively charged copper sphere rests on an insulating mat. A negatively charged polythene rod is brought near to the copper sphere. Which diagram shows the charge distribution on the sphere?

• A
• B
• C
• D