Maharashtra State Board
- A parallel plate capacitor has circular plates of radius 8 cm and plate separation 1mm. (A) 1.78 × 10⁻⁸ C 2
- If the difference between the radii of the two spheres of a spherical capacitor is increased The capacitance of a spherical capacitor is C = 4πε₀ (a b/b-a) where a and b are the radii of the concentric inner and outer conducting shel... 1
- A metal plate is introduced between the plates of a charged parallel plate capacitor. Suppose the parallel-plate capacitor has capacitance C₀, plates of area A and separation d. Assume the metal sheet introduced has the same a... 1
- The safest way to protect yourself from lightening is to be inside a car. Justify. There is danger of lightning strikes during a thunderstorm. Because trees are taller than people and therefore closer to the clouds above, t... 1
- A capacitor has some dielectric between its plates and the capacitor is connected to a DC source. Assume a parallel-plate capacitor, of plate area A and plate separation d is filled with a dielectric of relative permittivity (dielectric c... 1
- Two charges of magnitudes -4Q and +2Q are located at points (2a, 0) and (5a, 0) respectively. The sphere of radius 4a encloses only the negative charge Q₁ = -4Q. The positive charge Q₂ = +2Q being located at a distance of 5a from the... 1
- A 6 µF capacitor is charged by a 300 V supply. It is then disconnected from the supply and is connected Data: C = 6 µF = 6 × 10⁻⁶ F = C₁, V = 300 V C₂ = 3 µF The electrostatic energy in the capacitor = 1/2 Cv² = 1/2 (6 × 10⁻⁶)(300)² = 3 × 10⁻⁶... 1
- One hundred twenty five small liquid drops, each carrying a charge of 0.5 µC and each of diameter 0.1 m form a bigger Data : n = 125, q = 0.5 × 10⁻⁶ C, d = 0.1 m The radius of each small drop, r = d/2 = 0.05 m The volume of the larger drop being equal to the... 1
- The dipole moment of a water molecule is 6.3 × 10-30 Cm. A sample of water contains 1021 molecules Data: p = 6.3 × 10⁻³⁰ C∙m, N = 10²¹ molecules, E = 2.5 × 10⁵ N/C, θ₀ = θ₁ = 0°, θ = θ₂ = 90° W = pE(cos θ₀ – cos θ) The total work required... 1
- In a parallel plate capacitor with air between the plates, each plate has an area of 6 × 10-3 m2 and the separation Data: k = 1(air), A = 6 × 10⁻³ m², d = 2 mm = 2 × 10⁻³ m,V = 100V, t = 2 mm = d, k₁ = 6, ε₀ = 8.85 × 10⁻¹² F/m (i) The capacitance of the ai... 1
- What is gravitational Potential ? We measure the gravitational potential energy U of a body (1) by assigning U = 0 for a reference configuration (such as the body at a refere... 1
- Due to a single charge at a distance r, Force (F ) α 1/r2, Electric field (E ) α 1/r2 but Potential (V) α 1/ r. At a point a distance r from an isolated point charge, the force F on a point charge and the electric field E both vary as 1/r2, while the p... 1
- Is electrostatic potential necessarily zero at a point where electric field strength is zero? Justify. Electric potential is a scalar quantity while electric field intensity is a vector quantity. When we add potentials at a point due two or mo... 1
- If we apply a large enough electric field, we can ionize the atoms and create a condition In a sufficiently strong electric field, the molecules of a dielectric material become ionized, allowing flow of charge. The insulating prop... 1
- Series combination is used when a high voltage is to be divided on several capacitors. Capacitor with minimum capacitanc Series combination of capacitors Equivalent capacitance is less than the smallest capacitance in series. For several capacitors of given cap... 1
- Imagine you are the monitor of the class. You are asked to conduct an interview of a famous singer. Good Morning! Sir. I am excited as I got a chance to interview you and to know you better. Here are some questions that will help us to know... 1
- Write two past participles in which the last two letters are doubled. ‘slipped’ and ‘dropped’ are two past participles in which two letters are doubled. 1
- Identify the type of sentence: I could manage well enough. “I could manage well enough” is the example of an assertive sentence. 1
- Complete the following word chain of verbs: Write e ____, _____,______,_______ Enter, Remember, Report, Think 2
- Spot the error in the following sentence and rewrite it: The novel was publishing in 1952 The novel was published in 1952 2
- Find out two hidden words of minimum of 4 letters from: “Endurance” cure, race and near are some words of minimum of 4 letters from “Endurance” 1
- Punctuate the following sentence: did you hear him he whispered “Did you hear him?” he whispered. 3
- Pick out the infinitive from the following sentence I just had to do it “to do” is the infinitive in the sentence 2
- Make a meaningful sentence of your own using the following phrase “to look into” I may need to look into the reason why he failed in the exam. 1