AP EAPCET (Engineering) Electromagnetic Induction — practice questions
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Practice AP EAPCET (Engineering) 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?In electromagnetism, self-inductance plays a role similar to which mechanical property?Which statement about the coil of a simple ac generator is correct?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 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?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?Who demonstrated around 1830 that a moving magnet can induce electric current?A magnet moved towards a fixed coil is then held still. What does the galvanometer show?What happens to the galvanometer deflection when an iron rod enters the coils?A loop of area 0.2 square metre in a 0.5 T field has its normal at 60 degrees. Flux?Flux through a coil is zero when its plane is placed how relative to the field?According to Lenz's law, the induced current tends to do what to the change that produces it?A north pole is pushed towards a closed coil. How do flux and coil force behave?When a magnet is pushed into a closed coil, where does the work done against the repulsion end up?If induced current aided the magnet's approach, what would become possible?A 0.5 m rod moves at 4 m/s perpendicular to a 0.2 T field. What emf appears across its ends?A rod of length 1 m moves at 10 m/s perpendicular to a field of 0.5 T. What is the induced emf?A conducting rod moves in a uniform field and its speed is doubled. How does the motional emf change?A rod moves parallel to the magnetic field lines. What is the motional emf across it?A coil of 100 turns sees its flux fall from 0.05 Wb to 0.02 Wb in 0.3 s. What is the average induced emf?The flux through a single loop varies as 3t squared + 2t (in Wb, t in s). What is the induced emf at t = 2 s?The negative sign in Faraday's law of induction represents which fact?Mutual inductance of coil 1 with respect to coil 2 is M12. What general relation holds with M21?Mutual inductance is 2 H and current in one coil changes at 3 A/s. Induced emf?Self-inductance of a coil is described as a measure of what?A coil of self-inductance 0.2 H has its current changing at 5 A/s. What is the self-induced emf?A coil of self-inductance 0.5 H carries 4 A which is switched off uniformly in 0.1 s. What average emf is induSelf-inductance of a long solenoid depends on its turns per unit length n as which power?The turns per unit length of a solenoid are doubled, size unchanged. How does its self-inductance change?Inserting a soft iron core in a solenoid increases its self-inductance. Which quantity in the formula is respoWhat energy conversion takes place in an ac generator?In an ac generator, the coil that is rotated in the magnetic field is called what?How are the ends of the coil of an ac generator joined to the external circuit?A coil of N turns, area A rotates at n revolutions per second in a field B. What is the maximum emf?A coil has 50 turns, area 0.02 square metre, in a 0.4 T field, rotating at 100 rad/s. What is the peak emf?The speed of rotation of an ac generator coil is doubled, other things equal. How does the peak emf change?In an ac generator, the angle between B and the coil's area vector at time t is wt. What is the flux at that iA generator coil's plane is perpendicular to the field. What is the emf then?Induced emf in a loop is what when the flux through it stays constant?What are the dimensions-based units of emf, as listed for electromotive force?