Related InterviewSolutions

• What is the relative permeability of an air-core inductor, if its self-inductance increases from 0.5 mH to 50 mH due to the introduction of an iron core into it?(a) 100(b) 0.1(c) 10000(d) 0.0001This question was posed to me in an interview for internship.Question is taken from Electromagnetic Inductance in chapter Electromagnetic Induction of Physics – Class 12
• What is the magnitude of the force on a current carrying conductor of length L in a perpendicular magnetic field B?(a) F=\(\frac {I}{lB}\)(b) F=IlB^2(c) F=I^2lB(d) F=IlBThe question was posed to me in homework.My doubt is from Energy Consideration: A Quantitative Study topic in section Electromagnetic Induction of Physics – Class 12
• A bar of length 0.15 m slides along metal rails at a speed of 5 m/s. The bar and rails are in a magnetic field of 40 T, pointing out into the page. The resistance of two resistors in parallel is both 20 Ω, and the resistance of the bar is 5 Ω. What is the current in the bar?(a) 1 A(b) 2 A(c) 3 A(d) 5 AI have been asked this question during an online exam.My doubt is from Electromagnetic Induction in section Electromagnetic Induction of Physics – Class 12
• When is the magnetic flux said to be positive?(a) θ = 180^o(b) θ = 360^o(c) θ = 0^o(d) θ = 90^oThis question was posed to me during a job interview.My enquiry is from Electromagnetic Induction in division Electromagnetic Induction of Physics – Class 12
• Identify the factor on which self-inductance does not depend.(a) Number of turns(b) Area of cross-section(c) Permeability of the core material(d) The permittivity of the core materialI have been asked this question during an online exam.My question is taken from Electromagnetic Inductance topic in chapter Electromagnetic Induction of Physics – Class 12
• Identify the significance of energy consideration from the following.(a) Energy consideration provides a link between the force and energy(b) Energy consideration provides a link between the current and energy(c) Energy consideration provides a link between the mechanical and thermal energy(d) Energy consideration provides a link between the voltage and energyI have been asked this question in an internship interview.My question is from Energy Consideration: A Quantitative Study topic in division Electromagnetic Induction of Physics – Class 12
• Which of the following statement is valid?(a) Lenz’s law is a consequence of the law of conservation of energy(b) Lenz’s law is a consequence of the law of conservation of momentum(c) Lenz’s law is a consequence of the law of conservation of force(d) Lenz’s law is a consequence of the law of conservation of massThis question was addressed to me during an online interview.I would like to ask this question from Electromagnetic Induction in section Electromagnetic Induction of Physics – Class 12
• ‘X’ states that the direction of induced current in a circuit is such that it opposes the cause or the change which produces it. Identify X.(a) Faraday’s law(b) Lenz’s law(c) Maxwell’s law(d) Ampere’s lawI have been asked this question in class test.Question is taken from Electromagnetic Induction in chapter Electromagnetic Induction of Physics – Class 12
• The magnetic flux in a closed circuit of resistance 20 Ω varies with time t as Φ = 4t^3 + 2t^2 – 15t + 3. Calculate the magnitude of induced emf at t = 1s.(a) 3 V(b) 4 V(c) 5 V(d) 6 VThe question was asked by my college director while I was bunking the class.My question is from Faraday’s Law of Induction topic in division Electromagnetic Induction of Physics – Class 12
• Identify the correct dimensions of magnetic flux.(a) [M^3 L^2 A^-1 T^-2](b) [M L^2 A^-1 T^-2](c) [M^2 L^2 A^-1 T^-2](d) [M L^2 A^-1 T^2]The question was asked in an online quiz.The question is from Electromagnetic Induction topic in portion Electromagnetic Induction of Physics – Class 12