A parallel plate capacitor with circular plates of radius 1 m has a capacitance of 1 nF. At t = 0, it is connected for charging in series with a resistor R = 1 MΩ across a 2V battery (as shown in the figure). Find the magnetic field at a point P, halfway between the centre and the periphery of the plates, after t = 10–3 s. (The charge on the capacitor at time t is (t) = CV[1 – exp (–t/τ)], where the time constant τ is equal to CR.) 

1. 0.74×10-13 T2.  0.67×10-13 T3.  0.74×10-12 T4. 0.67×10-12 T

Subtopic:  Maxwell's Equations |
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