Doubtly
@Doubtly · Joined Feb 2021
- Answers
- 3,792
- Questions
- 4,033
- Upvotes received
- 424
- 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
- Explain why two field lines never cross each other at any point? If two field lines cross each other at a point, then electric field intensity will show two directions at that point. This is not possible.... 1
- नामदेव महाराज म्हणतात की, आकाशातील ढगांना पाहून चातक पक्षी त्याची स्वत:ची तहान भागवण्यासाठी विनवणी करतो. नामा म्हणे मेघा जैसा। विनवितो चातक तैसा।। 2
- खाली दिलेल्या अर्थाच्या ओवी अभंगातून शोधून लिहा. सवेंचि झेंपावें पक्षिणी। पिली पडतांचि धरणीं।। 2
- सहसंबंध लिहा. (i) कनवाळू : माता :: चिंतीत …………………… (ii) धावे : धेनु :: झेंपावें …………………… (i) हरणी (ii) पक्षिणी 2
- खाली दिलेल्या कंसातील योग्य पर्याय निवडून अभंगांच्या ओळी पूर्ण करा. अग्निमाजि पडे बाळू। ……………………….” धांवें कनवाळू।। (i) माता (ii) दास (ii) धेनु 2
- उत्तरे लिहा. (i) संत नामदेव यांचे दास – (ii) संत नामदेव यांना धावून यायला सांगतात – (i) संत नामदेव यांचे दास – [श्री विठ्ठलाचे] (ii) संत नामदेव यांना धावून यायला सांगतात – [श्री विठ्ठलाला] (iii) मेघांची विनवणी करणारा – [चातक... 1
- चातक पक्षी कोणाची विनवणी करतो? चातक पक्षी मेघाची (ढगांची) विनवणी करतो. 2