Electrostatics 1

When an object gains electrons it becomes __________

• Neutral

• Positively charged

• Negatively charged

When a silver atom looses an electron, its net charge (in coulombs) is

• +1

• -1

• +1,6 x 10^-19

• -1,6 x 10^-19

When a ballon is rubbed agaist a jersey and brought near a thin stream of tap water. The balloon attracts the thin stream of water because_____

• water is acidic

• water is a base

• water gets polarized

• water is liquid

When -2nC comes in contact with +6nC the charge of each sphere after contact is _________

• 4 nC

• 8 nC

• -2 nC

• +2 nC

When two rulers are rubbed against wool will ________ each other because they are ___________ charges

• attract; like

• attract, unlike

• repel; like

• repel; unlike

The gold leaves of an electroscope deflect when a positively charged ruler is brought to the metal cap because __________

• both leaves are positively charged

• both leaves are positively charged

• one leaf is positive and the other is negative

• one leaf is negative and the other is neutral

• one leaf is positive and the other is neutral

LIKE CHARGES

• ATTRACT

• REPEL

UNLIKE CHARGES

• ATTRACT

• REPEL

ELECTROSTATIC FORCE IS

• F=ma

• f=GMm/R^2

• F=KqQ/r^2

the value of elementary charge

• 6.4x10^-19 C

• 1.6x10^-19C