31 Year NEET Previous Year Questions: Electromagnetic Induction - NEET MCQ

A 100 millihenry coil carries a current of 1A.Energy stored in its magnetic field is [1991]

If the number of turns per unit length of a coil ofsolenoid is doubled, the self-inductance of thesolenoid will [1991]

A rectangular coil of 20 turns and area of crosssection 25 sq. cm has a resistance of 100Ω. If amagnetic field which is perpendicular to the planeof coil changes at a rate of 1000 tesla per second,the current in the coil is [1992]

The total charge induced in a conducting loopwhen it is moved in a magnetic field depend on         [1992]

What is the self-inductance of a coil whichproduces 5V when the current changes from 3ampere to 2 ampere in one millisecond?       [1993]

If N is the number of turns in a coil, the value ofself inductance varies as [1993]

A conductor of length 0.4 m is moving with aspeed of 7 m/s perpendicular to a magnetic fieldof intensity 0.9 Wb/m2. The induced e.m.f.across the conductor is               [1995]

A varying current in a coil changes from 10A tozero in 0.5 sec. If the average e.m.f induced inthe coil is 220V, the self-inductance of the coil is              [1995]

Two coils have a mutual inductance 0.005 H.The current changes in the first coil accordingto equation I = I₀ sin ωt, where I₀ = 10A and ω = 100π radian/sec. The maximum value of e.m.f.in the second coil is [1998]

In an inductor of self-inductance L = 2 mH,current changes with time according to relationi = t²e^–t. At what time emf is zero?              [2001]

The magnetic flux through a circuit of resistance R changes by an amount Δφ in a time Δt. Then the total quantity of electric charge Q that passes any point in the circuit during the time Δt is represented by        [2004]

As a result of change in the magnetic flux linkedto the closed loop shown in the Fig,

an e.m.f. V volt is induced in the loop. The work done (joules) in taking a charge Q coulomb once  along the loop is

[2005]

Two coils of self inductances 2 mH and 8 mH areplaced so close together that the effective fluxin one coil is completely linked with the other.The mutual inductance between these coils is              [2006]

A long solenoid has 500 turns. When a currentof 2 ampere is passed through it, the resultingmagnetic flux linked with each turn of thesolenoid is 4 ×10^–3 Wb. The self- inductance ofthe solenoid is        [2008]

A rectangular, a square, a circular and an elliptical loop, all in the (x – y) plane, are moving out of a uniform magnetic field with a constant velocity,    The magnetic field is directed along the negative z axis direction. The induced emf, during the passage of these loops, out of the field region, will not remain constant for      [2009]

A conducting circular loop is placed in a uniformmagnetic field of 0.04 T with its planeperpendicular to the magnetic field. The radiusof the loop starts shrinking at 2 mm/s. The induced emf in the loop when the radius is 2 cmis [2009]

A conducting circular loop is placed in a uniform magnetic field, B = 0.025 T with its plane perpendicular to the loop. The radius of the loop is made to shrink at a constant rate of 1 mm s^–1. The induced e.m.f. when the radius is 2 cm, is                             [2010]

The current i in a coil varies with time as shown in the figure. The variation of induced emf with time would be [2011]

A coil of resistance 400Ω is placed in a magneticfield. If the magnetic flux φ(wb) linked with thecoil varies with time t (sec) as φ = 50t² + 4. Thecurrent in the coil at t = 2 sec is : [2012]

In a coil of resistance 10 Ω, the induced current developed by changing magnetic flux through it, is shown in figure as a function of time. The magnitude of change in flux through the coil in Weber is :          [2012M]

A wire loop is rotated in a magnetic field. Thefrequency of change of direction of the inducede.m.f. is [NEET 2013]

A current of 2.5 A flows through a coil ofinductance 5 H. The magnetic flux linked withthe coil is [NEET Kar. 2013]