A parallel-plate capacitor with circular plates has a steady charging current of

Question

A parallel-plate capacitor with circular plates has a steady charging current of 4.0 A . The wires into and out of the plates attach to the plate centers.

Part A

If the radius of each plate is 60 mmand there is no dielectric between the plates, what is the magnetic field magnitude at a position that lies between the plates and is 30 mmfrom the (imaginary) line joining their centers?

Express your answer with the appropriate units.

.318•107T

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.318•107T

Explanation / Answer

radius, R = 60 mm = 0.06 m

we want to find magnetic field at , r = 30 mm = 0.03 m

when we Ampere's law we get,

B = mue*I*r/(2*pi*R^2)

= 4*pi*10^-7*4*0.03/(2*pi*0.06^2)

= 6.67*10^-6 T

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