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Physics-

General

Easy

Question

A solenoid having an iron core has its terminals connected across an ideal DC source and it is in steady state. If the iron core is removed, the current flowing through the solenoid just after removal of rod

increases
decreases
remains unchanged
nothing can be said

The correct answer is: increases

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A conducting disc of radius R is placed in a uniform and constant magnetic field B parallel to the axis of the disc. With what angular speed should the disc be rotated about its axis such that no electric field develops in the disc. (the electronic charge and mass are e and m)

A conducting disc of radius R is placed in a uniform and constant magnetic field B parallel to the axis of the disc. With what angular speed should the disc be rotated about its axis such that no electric field develops in the disc. (the electronic charge and mass are e and m)

physics-General

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The battery shown in the figure is ideal. The values are e = 10 V, R = 5 $Ω$ , L = 2H . Initially the current in the inductor is zero. The current through the battery at t = 2s is

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