Physics Electrostatic 2

… is the buildup of electrical charge within or on the surface of an insulated object.

• Static electricity

• Dynamic electricity

• Hi-Power electricity

• Low-Power electricity

Look at table data that show phenomena of static electricity!

The correct statement is …

• 1 and 3

• 1, 2 and 3

• 2 and 4

• only 4

Particles that surround the nucleus is …

• Proton

• Neutron

• Electron

• Atom

Below are some ways to make an object charge, except …

• rubbing

• earthing

• conduction

• induction

Three neutral spheres, electrically insulated from the environment, are touching each

other as shown in the picture below. A positively charged glass rod approaches the

spheres, as shown, causing them to move apart from each other. The 3 spheres

separate while the rod is close, but never touching any sphere.

After the rois close, but never touching any sphere.

After the rod is put away, the spheres stay charged on the following

• 2 positively charged and one negatively charged

• 2 neutral and 1 positive

• 1 neutral, 1 positive, 1 negative

• 2 neutral and 1 negative

Look at the picture, which one is shown a correct process about induction at a simple electroscope?

• A

• B

• C

• D

Look at the picture of plastic ruler rubbed with woolen cloth!

After cloth and ruler rubbed each other, the movement of electron and charge that happen to ruler is…

• 
• 
• 
• 

The correct Electric Field Line shown in the picture is …

• 
• 
• 
• 

A metallic sphere has a negative electric charge of 3.2 x 10 -4 C. How many electrons does it have? (electron charge: 1.6 x 10 -19 C)

• 2x10¹⁵

• 200

• more than 2x10¹⁵

• 2x10¹⁰

There are two charges q 1 = 6 μC and q 2 = 12 μC separated each other as far as 30 cm. What is the magnitude of repelled force happen between these two charge? Use k = 9 x 10⁹ N m²/C ² !

• 14.4 N

• 7.2 N

• 3.6 N

• 1.8 N