Electromagnetic Field Theory
A vector field A = p In is given in Cartesian coordinates. In cylindrical coordinates it will be represented as

 A = sinφ Ir.
 A = cosφ Ir + sinφ Iφ.
 A = cosφ Ir - sinφ Ir.
 A = cosφ Ir.

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Electromagnetic Field Theory
The effective reactance of an inductive coil

 decreases because of stray capacitance as the frequency increases.
 increases because of stray capacitance as the frequency increases.
 remains same irrespective of the frequency.
 none of these.

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