Electromagnetic Induction PYQs Set 10 (PDF)

Set 10 of 10 · Questions 271-274 of 274

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Mere Teacher · Previous Year Questions NEET Physics · Electromagnetic Induction · Set 10 (Q271-274)
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271. $The self induction (L) produced by solenoid oflength ' l' having ' N' number of turns and cross sectional area ' A' is given by the formula (φ = magnetic flux, μ_{0} = permeability of vacuum)$ (1) $L = N φ$ (2) $L = μ_{0} NAl$ (3) $L = \frac{μ _{0} N ^{2} A}{l}$ (4) $L = \frac{μ _{0} NA}{l}$ 272. $A constant magnetic field of 1T is applied in the x > 0 region. A metallic circular ring of radius 1m is moving with a constant velocity of 1m/s along the x-axis. At t = 0 s, the center of O of the ring is at x = -1m. What will be the value of the induced emf in the ring at t = 1 s? (Assume the velocity of the ring does not change.)$ (1) $1V$ (2) $2 π V$ (3) $2V$ (4) $0V$ 273. $An inductor may store energy in$ (1) $its electric field$ (2) $its coils$ (3) $its magnetic field$ (4) $both in electric and magnetic fields$ 274. $A conducting bar of length L is free to slide on two parallel conducting rails as shown in the figure Two resistors R_{1} and R_{2} are connected across the ends of the rails. There is a uniform magnetic field B pointing into the page. An external agent pulls the bar to the left at a constant speed v The correct statement about the directions of induced currents I_{1} and I_{2} flowing through R_{1} and R_{2} respectively is:$ (1) $Both I_{1} and I_{2} are in anticlockwise direction$ (2) $Both I_{1} and I_{2} are in clockwise direction$ (3) $I_{1} in clockwise direction and I_{2} is in anticlockwise direction$ (4) $I_{1} is in anticlockwise direction and I_{2} is in clockwise direction$