Chapter 8 Electricity
Choose:1-Electric charges are of two general types
(a) Positive and negative
(b) Positive
(c) Negative
2- Two objects that have excess opposite charges, one positively charged and the
other negatively charged
(a) attract each other
(b)repel each other
(c)none
3-electrons have ………………. Charge
(a) Negative
(b) positive
(c) Zero
(b) positive
(c) Zero
4-protons have……………… charge
a) Negative
5-neutrons have …………… charge
a) Negative
(b) positive
(c) Zero
6- ………………………..is defined as the electric force per unit charge
(a) Electric field
(b) Electric force
(c)charge
7-The electric field is radially outward from …………….. charge and radially in toward
…………… charge
(a) negative --positive
(b)positive –negative
(c)a and b
(b) coulomb
(c)Farad
8- The unit of Capacitance C
(a)Joule
9-The unit of charge (q) is
(a)coulomb
(b)newton
(c)volt
10-The unit of constant coulombs law (K) is
(a) N.C2/m2
(b)N.m2/C2
(c)watt
11-The unit of potential deferent is
(a)newton
(b)volt
(c)joule
1
12- The unit of Electric Fields
(a)N/m
(b)N/C
(c)newton
13- The electric force is much ………………………than the gravitational force
(a) stronger
Defined:-
(b)week
(c)zero
‫المصطلحات‬
1- Coulombs law
States that the electrical force between two charged objects is directly proportional
to the product of the quantity of charge on the objects and inversely proportional to
the square of the separation distance between the two objects .
2- Electric field
Is defined as the electric force per unit charge
3- The capacitance:
of a capacitor is defined as the ratio of the magnitude of the charge on either
conductor to the magnitude of the potential difference between the conductors
4-The three ways of charging an object:, Charging by friction , conduction and induction
5- Charging by friction
Rubbing glass with silk or saran wrap generally leaves the glass with a
positive charge; rubbing PVC rod with fur generally gives the rod a
negative charge
6- Charging by conduction
Charging the conductor with the same sign as the charge on the object
7-Charging by induction –
The conductor will have a charge opposite in sign to that of the charged
object
2
Answers Q choose:-
1
A
2
a
3
a
11
B
12
B
13
A
4
b
5
C
6
a
3
7
B
8
c
9
a
10
B