Electric charges and fields

Question 1

electrostatics

Answer 1

deals with the study of forces. fields, and potentials arising from static charges

Question 2

+ve charges eg

-ve charges eg

Answer 2

glass rod, cat’s fur

plastic rod, silk thread

Question 3

wht is used to detect charges in a body

Answer 3

gold-leaf electroscope

Question 4

EARTHING

Answer 4

the phenomona where we bring a charged body in contact to the earth or the ground and all the excess charge on the body leaks to the surface

Question 5

charging by induction

Answer 5

the process of charging a neutral body by bringing a charged body close to it without making actual contact

Question 6

basic properties of electric charges and explain

Answer 6

1 addition of charges
2 conservation of charges:
total charge in isolated system remains constant and conserved, charge can neither be created nor be destroyed
3 quantisation of charges:
the charge on the body isalways equal to the integral multiple of basic uintof charge
Q = +-ne (e= 10-19 x 1.6)

Question 7

Eo/ efsalan aka define

Answer 7

permitivity of free space

Question 8

primciple of super position

Answer 8

The principle of superposition states that if a system contains a number of interacting charges, then the net force on any one charge due to the other charges is the vector sum of all the forces exerted on it by all the other charges. The individual forces are unaffected due to the presence of other charges.

Question 9

physical significance of electric field

Answer 9

ncert finger pg 4

Question 10

The property which diff the 2 kind of charges

Answer 10

Polarity of charge

Question 11

Positive and negative charges were named by

Answer 11

Benjamin franklin

Question 12

1 columb

Answer 12

1 ampere of current flowing through a wire in 1 sec

Question 13

A cubic price of copper of side 1 cm contains about how many electrons

Answer 13

2.5 X 10²⁴

Question 14

Sensitive device to measure force

Answer 14

Torsion

Question 15

Value of K

Answer 15

9 X 10^9 Nm2/c²

Question 16

εo value

Answer 16

8.854 X 10-¹² C2/Nm²

Question 17

K depends on (coulomb’s law)

Answer 17

Nature of medium

System of units

Question 18

1/e

Answer 18

6.25 X 10 -18

Question 19

Ratio of electrostatic and gravitational force

Answer 19

2.4 X 10 ^39

Question 20

Mass of proton

Mass of neutron

Answer 20

1. 67 X 10-27 kg

1. 68 X 10-27 kg

Question 21

Mass of electron

Answer 21

9.11 X 10^-31 kg

Question 22

Electric field lines

Answer 22

EFL are pictorial mapping of the electric around a configuration of a point
It’s drawn in the way that the tangent to it on each point is in the direction of the net field of the point