BITSAT Electromagnetic Induction — practice questions
28 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice BITSAT Electromagnetic Induction in the app →Faraday's law of electromagnetic induction states EMF induced equals:Lenz's law states the induced current direction is such that it:SI unit of magnetic flux is:Mutual inductance M between two coils is defined by EMF induced in coil 2:Self-inductance L of a coil relates EMF to:Energy stored in an inductor of inductance L carrying current I:Magnetic flux Φ = B A cos θ. If a coil of area 0.1 m² in B = 0.5 T is rotated from θ=0° to θ=60° in 0.2 s, aveA rod of length L moves with velocity v perpendicular to magnetic field B. Motional EMF:In a transformer with N₁ = 100 (primary), N₂ = 500 (secondary), if input is 10 V, output is:In LR circuit, time constant τ:For an ideal inductor in AC circuit at angular frequency ω, inductive reactance:For an ideal capacitor in AC, capacitive reactance:In an LCR series AC circuit, impedance:Resonance in series LCR circuit occurs when:RMS value of an AC voltage with peak V₀:Average power in AC LCR circuit:A 100-turn coil of area 200 cm² is rotated at 50 rev/s in a field of 0.05 T. Peak EMF:A solenoid has L = 2 H. Current decreases from 5 A to 1 A in 0.1 s. EMF induced:In a step-down transformer with 1000:100 turn ratio (primary:secondary), 220 V input, 1 A secondary current. PQuality factor Q for series LCR at resonance:Two coils with self-inductances L₁ = 4 H, L₂ = 9 H. Maximum possible mutual inductance:Energy density of magnetic field B in vacuum:In an LR circuit with V = 12 V, R = 4 Ω, L = 2 H, current after t = 0.5 s:A capacitor C in series with inductor L (LC circuit) oscillates with frequency:In AC circuit with only inductor, average power consumed over one full cycle:For an AC generator with EMF ε(t) = ε₀ sin(ωt), the RMS EMF:Phase difference between voltage and current in pure capacitor in AC:Inductive reactance increases linearly with frequency. At f = 50 Hz, X_L = 100 Ω. At f = 200 Hz, X_L =