Electrostatics Flashcards
what is an inherent property of an object according to physics?
prove that there are only 2 charges?
mass and charge
what is electrostatic induction?
explain with one example.
a change in the distribution of electrical charge caused by the influence of nearby charges.
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
- a device used for detecting & testing the nature & magnitude of charge on a body.
- similar charges repel each other.
- pg 83
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?
direction of force will always be along the line joining the 2 charges
what is electric field?
formula for electric field intensity? unit? symbol? quantity?
how to find the direction of electric field intensity?
the direction of electric field intensity at a point will be the direction of force on a +ve test charge at that point.
what are electric field lines?
direction for +ve & -ve charge?
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
what is electric field intensity?
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?
how does electrostatic precipitator works?
how does electropainting works?
what is capacitor? explain its strucutre?
how does it work? dielectric?
what is capacitance of capacitor?
it depends on?
equation? unit of capacitance?
define 1F?
relate voltage with capacitance?
what does capacitance depend upon?
types of capacitors on the basis of?
shape
value of capacitance
media used in between the plates
explain voltage?
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
in series combin. of capacitors? what will be equal and diff? capacitance will be smaller/bigger?
the charges will be equal
net voltage will be equal too
capacitance will be diff.
greater the applied voltage, greater/smaller would be ____
C= ?
N/C is unit for what?
stored charge
Q/V
electric field intensity
the voltage across each capacitor differ. why?
when will potential difference be equal?
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
how to find potential difference of each capacitor in series?
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
how to find charge of each capacitor in parallel?
put the values in formula
Q=C V
V would be given and same for all capacitors
C would be given too
properties for capacitors in series? also derive the formula
3
why series capacitors is used when we need a smaller capacitance than available?
where do we get electrostatic force formula from?
draw diagram for it
the equivalent capacitance is always smaller than any individual capaictance
from Coulomb’s law k= 9x10^9 Nm^2/C^2
why parallel capacitors is used when we need a bigger capacitance than available?
draw diagram for it
the equivalent capacitance is always greater than any individual capaictance
