ElectroMagnetic InductionHard
Question
A uniform but time varying magnetic field B(t) exists in a circular region of radius a and is directed into the plane of the paper is shown. The magnitude of the induced electric field at point P at a distance r from the centre of the circular region
Options
A.is zero
B.decreases as 1/r
C.increases as r
D.decreases as 1/r2
Solution
or E(2πr) = πa2
for r ≥ a ∴ E =
∴ Induced electric field ∝
For r ≤ a
E(2πr) = πr2
or
or E ∝ r At r = a,
Therefore, variation of E with r (distance from centre) will be as follows :
Create a free account to view solution
View Solution FreeMore ElectroMagnetic Induction Questions
In the circuit shown, when dc of 250 V is applied, one ampere current passes through the circuit and when an alternating...A conducting ring of radius r with a conducting spoke is in pure rolling on a horizontal surface in a region having a un...Soft iron is used to make the core of transformer, because of its :...A conducting rod of length 2l is rotating with constant angular speed ω about its perpendicular bisector. A uniform...When a certain circuit consisting of a constant emf E, an inductance L and a resistance R is closed. the current in, it ...