Topic 16 - Electrostatic

The SI unit of electric charge is

• ampere

• volt

• joule

• coulomb

Which one of the followings does not involve the use of static electricity?

• laser printer

• spray painting

• transformer

• high-voltage generators

A rubber balloon becomes negatively charged by rubbing with hair. The balloon becomes negatively charged because it

• gains protons

• gains electrons

• loses electrons

• gains protons and loses electrons

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

• Electrons flow from the object

• Electrons flow on to the object

• Protons flow from the object

• Protons flow on to the object

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

• A

• B

• C

• D

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

• A

• B

• C

• D

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?

• A

• B

• C

• D

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?

• A

• B

• C

• D