TS EAMCET Electromagnetic Induction — practice questions
90 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice TS EAMCET Electromagnetic Induction in the app →Faraday's law of electromagnetic induction (in its quantitative form, with sign) is:Lenz's law is a manifestation of which fundamental conservation principle?The motional EMF induced in a conductor of length $\ell$ moving with velocity $v$ perpendicular to a uniform mThe SI unit of magnetic flux is:The SI unit of self-inductance $L$ is:The induced EMF in a coil due to changing current in itself is given by:The energy stored in an inductor of inductance $L$ carrying current $I$ is:Mutual inductance $M$ between two coils satisfies:The energy density (energy per unit volume) of a magnetic field $B$ in free space is:A conducting rod of length 1 m moves with velocity 5 m/s perpendicular to a uniform magnetic field of 0.4 T. TThe self-inductance of a long solenoid with $n$ turns per unit length, cross-section $A$ and length $\ell$ is:A solenoid of $N = 200$ turns, length $L = 20$ cm and cross-section $A = 5\ \text{cm}^2$ has self-inductance aA current of 4 mA in a coil of self-inductance 10 mH and 200 turns produces total flux:When two inductors $L_1$ and $L_2$ are connected in **series** (no mutual inductance), the equivalent inductanTwo inductors of 4 H and 12 H are connected in **parallel** (no mutual inductance). The equivalent inductance If the current in a coil of inductance 5 H changes from 2 A to 5 A in 0.1 s, the magnitude of induced EMF is:If the current in a primary coil changes at 30 A/s and induces 0.6 V in a secondary coil, the mutual inductancThe energy stored per unit volume in a magnetic field $B = 0.1$ T in vacuum (take $\mu_0 = 4\pi \times 10^{-7}A coil of self-inductance 2 H carries a current of 4 A. The energy stored in its magnetic field is: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 =Which unit is used for magnetic flux in the SI system?Magnetic flux through a surface is best described as which kind of quantity?Which scientist's name is given to the SI unit of inductance?Inductance is a quantity of which type?Around which decade did Faraday and Henry perform their induction experiments?What did Faraday compare his new discovery to when asked what use it was?The emf produced by self-induction in a coil is also known as what?In electromagnetism, self-inductance plays a role similar to which mechanical property?An ac generator converts which form of energy into electrical energy?In an ac generator, the ends of the rotating coil reach the outside circuit through what?Who is credited with developing the ac generator, as described in NCERT Class 12 Physics?Which statement about the coil of a simple ac generator is correct?What name is given to the rotating coil of an ac generator?A 500 MW generator could light how many 100 W bulbs at once?A rod 0.5 m long moves at 4 m/s at right angles to a 0.2 T field and its own length. What emf appears across iA uniform 0.5 T field is normal to a 0.2 square metre loop. How much flux passes through it?A 200-turn coil of area 0.02 square metre spins at 100 rad/s in a 0.5 T field. What is its peak emf?The flux through a single-turn loop falls from 0.04 Wb to 0.01 Wb in 0.3 s. What is the average induced emf?The current in a nearby coil changes at 4 A/s and the mutual inductance is 0.5 H. What emf is induced?A 5 H coil has its current changing at 2 A/s. What is the magnitude of the self-induced emf?A 2 H inductor carries a steady 3 A. How much energy is stored in its magnetic field?A coil of 500 turns links a flux of 2 x 10^-4 Wb per turn when it carries 0.5 A. What is its inductance?A coil of area 0.5 square metre sits in a 0.4 T field with its normal at 60 degrees to the field. What is the When the emf of a rotating coil is at its peak value, what is true of the flux through the coil?Generators driven by high-pressure steam from burning coal are called what?A generator coil turns at 50 revolutions per second. How long does one full cycle of its emf last?The dimensions of inductance equal the dimensions of flux divided by those of which quantity?In the energy stored in a coil, to which mechanical quantity is L analogous?By Lenz's law, how does an induced current flow?For coils 1 and 2, how are the mutual inductances M12 and M21 related?Lenz's law says the induced current also exerts a mechanical force that does what?Who performed the 1831 experiments in England producing current from magnetic flux?Who gave the rule for direction of induced current after duplicating Faraday's work?Faraday's second law: induced emf is proportional to what?Why is Faraday's first law called a qualitative law?Why does a metal ring jump when the coil below it is switched on?The rate of change of magnetic flux measured in weber per second corresponds to which electrical quantity?A 0.2 m conductor moves at 10 m/s across a 0.5 T field. What emf is induced?Rod length is halved, speed doubled in a uniform field. How does emf change?The number of turns of a long solenoid is doubled while its length and area stay fixed. How does its inductancA closely wound coil of 200 turns has L = 10 mH and carries 4 mA. What is the flux through each turn?A toroid has 1200 turns, minor radius 2.0 cm and major radius 15 cm. What is its self-inductance?An inductor of 4 H stores 0.5 J of energy. What current flows through it?