Electrostatics-chap. 19

Question 1

Atom

Answer 1

small central nucleus, containing positively charged protons, neutral neutrons, surrounded at large distances by negative electrons

Question 2

Conductor

Answer 2

substance through which electric charge can flow

Question 3

Insulator

Answer 3

substance through which electric charge cannot flow

Question 4

What’s the gold leaf electroscope used for?

Answer 4

to detect the presence of electric charge, and indicate its size

Question 5

Two ways of charging an object

Answer 5

by contact

by induction

Question 6

How is an object charged by induction?

Answer 6

If a polythene rod is rubbed with a woolen cloth, some of the electrons from the cloth rub onto the rod. The rod acquires extra electrons so it becomes negatively charged.

Question 7

How is an object charged by induction?

Answer 7

Bring a negatively charged rod near a neutral one without touching, connect the object to earth, disconnect earth connection, remove rod

Question 8

What’s a Van der Graff generator?

Answer 8

machine for storing large static charge

Question 9

State Couloumb’s Law

Answer 9

states that the force of attraction or repulsion between two point charges is directly proportional to the product of the charges and inversely proportional to the square of their distance apart.

Question 10

Electric Field definition

Answer 10

Region where an electric experiences a force