Doubtly
@Doubtly · Joined Feb 2021
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- A parallel plate capacitor with air between the plates has a capacitance of 8 pF (lpF = 10-12F). C = 8pF, C = fracε₀ ~A~d C' = fracε_r ε₀ ~Ad/2 = 2ε_r ∴ C' = 2 x 6 x 8 x 10⁻¹² F = 96 pF 1
- In a parallel plate capacitor with air between the plates, each plate has an area of 6 x 10-3 m2 A = 6 x 10⁻³ m² d = 3 mm = 3 x 10⁻³m C = fracε₀ ~A~d = frac8.85 × 10⁻¹² × 6 × 10⁻³3 × 10⁻³ = 17.70 x 10⁻¹² = 17.7 pF Q = CV = 17.7 x 10⁻¹² x... 1
- A 12pF capacitor is connected to a 50V battery. How much electrostatic energy is stored in the capacitor? C = 12 pF, V = 50V E = 1 / 2 CV² = 1 / 2 x 10⁻¹² x 50 x 50 = 150 x 10⁻¹⁰ = 1.5 x 10⁻⁸ J 1
- Show that the force on each plate of a parallel plate capacitor has a magnitude equal to \(\frac { 1 }{ 2 }\) QE, where Force = 1 / 2 QE Work done = 1 / 2 V x Q The physical origin of the factor 1 / 2 in the force formula lies in the fact that just outside the... 2
- A μ piF capacitor is charged by a 200 V supply. It is then disconnected from the supply C₁ = 4 x 10⁻⁶F V = 200 V C₂ = 2 x 1o⁻⁶F E₁ = 1 / 2 C₁V² = 1 / 2 x 4 x 10⁻⁶ x 200 x 200 = 8 x 1o⁻² Q = C₁V = 4 x 10⁻⁶ x 200 = 8 x 10⁻⁴ C E₂ =... 1
- (a) Are potential difference and potential energy the same? (b) If they are not the same, then define them. (a) No. The potential difference is a field property. Potential energy is the interaction energy of charge configuration. (b) The electrosta... 1
- A proton and an electron move between two points having a potential difference V. (a) Both gain the same energy Work done = energy gain = Potential difference x Charge The p.d and charge are the same for each. (b) One eV i... 1
- ‘Work is done on the charge ’. What do you understand by this? While moving the charge, work is to be done against repulsion of the field. 1
- What is the potential difference between the surface and interior point of the charged conductor? The potential at every point in a charged conductor is the same and is equal to the potential on the surface. Therefore the potential differ... 1
- How can we increase the capacitance of a conductor? By increasing the linear dimension. 2
- How will the applied voltage be divided among the capacitors? In a series combination, the applied voltage divides among the capacitors in inverse proportion to their capacitances: V ∝ 1/C . In series,... 1
- In which form and where is the energy of the capacitor stored? Electrical energy and is stored between the plates in the form of the electric field. 1
- Classify the following molecules into (a) Polar and non-polar. (H2O, H2, NH3, N2, CO2, CO, HCl, O2) (a) Polar molecules: H2O, NH3, CO, HCl Non-polar molecules: H2, N2, CO2, and O2 (b) polar and non-polar molecules: A molecule is said to be... 1
- Two copper spheres of radii, one hollow and the other solid are charged to the same potential. Both will hold the same charge No The capacity is small 2
- How much work is done in moving a 500 pC charge between two points on an equipotential surface? zero the work done in moving the given charge between two equipotential surfaces is equal to zero. 1
- Write the key features of the Python programming language what are comment How can you add Key features of python (https://doubtly.in/9633/what-key-features-list-python-class-12) How can you add comment !! To write a comment in Pyt... 2
- What is the main problem in pivot function with the earlier versions of Python how can it be resolved?
- What are the key features of a list in Python Class 12? Answer: A Python list is an ordered, mutable sequence that can hold items of any type, written inside square brackets. Key features of a lis... 1