Electrostatics

Question 1

what is an inherent property of an object according to physics?
prove that there are only 2 charges?

Answer 1

mass and charge

Question 2

what is electrostatic induction?
explain with one example.

Answer 2

a change in the distribution of electrical charge caused by the influence of nearby charges.

Question 3

what is an electroscope?
what is the working principle of this device?
how to check if a body has charge on it or no?
how to check the nature of charge? +ve/-ve

Answer 3

• a device used for detecting & testing the nature & magnitude of charge on a body.
• similar charges repel each other.
• pg 83

Question 4

state Coulomb’s Law?
formula?
what is constant? value? unit? depends on?
this law is only true for?
the repulsive force will be ____ & attractive will be _____.
as it is electrostatic force so a vector quantity so how can we calculate its magnitude & direction?

Answer 4

direction of force will always be along the line joining the 2 charges

Question 5

what is electric field?
formula for electric field intensity? unit? symbol? quantity?
how to find the direction of electric field intensity?

Answer 5

the direction of electric field intensity at a point will be the direction of force on a +ve test charge at that point.

Question 6

what are electric field lines?
direction for +ve & -ve charge?

Answer 6

the imaginary lines that indicate the direction of electric field intensity at a point.
for +ve charge, the field lines are directed away from +ve charge
for -ve charge, the field lines are directed towards the -ve charge

FMIGTN

Question 7

what is electric field intensity?

Question 8

what is electric potential?
formula?
unit? quantity? what if we move a charge from one point to another point inside the electric field?
what happens if point A is taken at infinty?

Question 9

how does electrostatic precipitator works?

Question 10

how does electropainting works?

Question 11

what is capacitor? explain its strucutre?
how does it work? dielectric?

Question 12

what is capacitance of capacitor?
it depends on?
equation? unit of capacitance?

Question 13

define 1F?

Question 14

relate voltage with capacitance?
what does capacitance depend upon?

Question 15

types of capacitors on the basis of?

Answer 15

shape
value of capacitance
media used in between the plates

Question 16

explain voltage?

Answer 16

often referred to as electric potential difference, is a measure of the electric potential energy per unit charge b/w 2 points in an electric circuit.

FMIGTN

Question 17

in series combin. of capacitors? what will be equal and diff?

Answer 17

the charges will be equal
net voltage will be equal too
capacitance will be diff.

Question 18

greater the applied voltage, greater/smaller would be ____
C= ?

Answer 18

stored charge
Q/V

Question 19

the voltage across each capacitor differ. why?
when will potential difference be equal?

Answer 19

This is because the capacitance differ for each capacitor.
sum of all potential difference will be = source of potential difference (voltage)

so if 9V is applied, the sum of voltage of all capacitors will be 9V. each capacitro might not be 9V

Question 20

how to find potential difference of each capacitor in series?

Answer 20

first find equivalent capacitance then find charge on each capacitance.
and then put the values in formula
V=Q/C

u have to find voltage seperately for each capacitor

Question 21

how to find charge of each capacitor in parallel?

Answer 21

put the values in formula
Q=C V

V would be given and same for all capacitors
C would be given too

Question 22

properties for capacitors in series? also derive the formula

Answer 22

3

Question 23

why series capacitors is used when we need a smaller capacitance than available?

draw diagram for it

Answer 23

the equivalent capacitance is always smaller than any individual capaictance

Question 24

why parallel capacitors is used when we need a bigger capacitance than available?

draw diagram for it

Answer 24

the equivalent capacitance is always greater than any individual capaictance

Question 25

properties of capacitors in parallel?

Answer 25

3

Question 26

what does capacitance depend upon?
formula for it?

Answer 26

FMIGTN

if it doesn’t depend on V & Q then what is this formual C=Q/V?

it’s cz the ratio even if Q increases V will increase proportionally therefore its constant and just a ratio

Question 27

the charge will be same in ____
the charge will be diff
the volatge will be same _______
the voltage will be diff. in _________

Answer 27

series
parallel
parallel
series