Ch 2. Electrostatic Potential And Capacitance Flashcards
The value of electric potential at a distance r from a point charge is
Inversely proportional to r
If the distance between the two charges is increased, then the electrostatic potential energy of the charges
Decreases
64 identical drops each of capacity 5uF combine to form a big drop. What will be the capacity of the big drop?
20 uF
Van de Graaff generator is an electrostatic machine which produces
Only high voltage
Three capacitors of capacitance 6uF are available. The minimum and maximum capacitances obtained are
2uF, 18uF
The net charge on a charged capacitor is
Zero
The value of electric potential at a distance r from a point charge q is
1/4πε₀ • q/r
Potential gradient is equal to
dV/dx
Electric potential is equal to
w/q
Two point charges of +10µC and -10µC are placed at a distance 40 cm in air. Potential energy of the system will be
-2.25J
The electric potential in equatorial position of an electric dipole is
Zero
The electric potential due to a small electric dipole at a large distance r from the centre of dipole is proportional to
1/r²
One Farad is equal to
1 CV⁻¹
Which of the following is correct for the capacity of a parallel plate capacitor?
ε₀ A/d
Equivalent capacity between A and B in figure is
C C
A B
C
Sum of charges on collecting plate and condensing plate of a charged capacitor is
Zero
Two capacitors each of capacity C are connected in parallel. The equivalent capacity is
2C
Two capacitors C₁ = 2µF And C₂ = 4µF are connected in series and a potential difference (p.d) of 1200V is applied across it. The potential differences across 2µF will be
800V
Three capacitors each of capacity C are connected in series. The resultant capacity will be
C/3
The stored energy of a capacitor charge to 100V, is 1J. Capacitance of the capacitor is
2 × 10₋₄ F
The equivalent capacity between A and B in the given figure is
6µF 6µF A B
6µF
9µF
64 identical drops each of capacity 5µF combine to form a big drop.
What is the capacity of big drop?
20µF
The equivalent capacity between A and B is
3µF
A B
2µF 4µF
20/9 µF
The equivalent capacity between points A and B is
C
4µF 4µF
4µF 4µF
2µF
A B
4/3 µF
Statement 1 : if a body is negatively charged its mass slightly increases
Statement 2 : To charge a body transfer of electron is done.
Both the statements are true and Statement 2nd is the correct explanation of statement 1st.
The charge on plate X and the given figure is?
20V 10V
Y X
C = 2µF
20µC
Statement 1 : The capacitance of a capacitor increases with increase in charge on its plate
Statement 2 : V ∝ Q
Both the statements are true and Statement 2nd is the correct explanation of statement 1st.
The capacity of any conductor is
C = q/v
Energy of a charged conductor is
E = 1/2 CV²
If n capacitors of equal capacity C₁ are connected in parallel, the equivalent capacity will be
C = nC₁
Dielectric strength for air is
3 × 10⁶ Vm⁻¹
Capacity of spherical condenser is
C = 4πε₀ (r R/ r - R)
