# Joint Entrance Examination/2000 Screening/Q029 Coil of wire with conducting ring at centre and variable current

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| Original Question by Dharav Here's the question... A coil of wire having finite inductance and resistance has a conducting ring placed co-axially within it. The coil is connected to a battery at time t = 0, so that a time dependent current I$_1$(t) starts flowing through the coil. If I$_2$(t) is the current induced in the ring, and B (t) is the magnetic field at the axis of the coil ,due to 1$_1$(t) then as a function of time (t > 0), the product I$_2$(t)B(t) (A) increases with time (B) decreases with time (C) does not vary with time (D) passes through a maximum Posted by Dharav 14:11, 17 August 2009 (UTC) | What's Up? Latest discussions on the forum Electricity-And-Magnetism-Help Joint Entrance Examination/2000 Screening/Q002 Uniform time varying magnetic field and induced electric field Joint Entrance Examination/AIEEE 2009/Q084 ELECTROSTAT Joint Entrance Examination/2000 Screening/Q012 Rotating particle with charge q mass m Joint Entrance Examination/2000 Screening/Q029 Coil of wire with conducting ring at centre and variable current Joint Entrance Examination/2000 Screening/Q021 Ionized gas subjected to electric and magnetic fields Physics-Help User:Thewinster/Sandbox User:Thewinster/Sandbox/Forum-Watch Joint Entrance Examination/2000 Screening/Q023 capcitors and dielectric, equivalent capcitance Joint Entrance Examination/2000 Screening/Q027 Wind power turbine relation between wind speed and output power Joint Entrance Examination/2000 Screening/Q030 Hollow Double Convex Lens with variable liquids inside |
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