A coil having N turns is wound tightly in the form of a spiral with inner and outer radii a and b respectively. When a current I passes through the coil, the magnetic field at the centre is

Question:

Options :

(a) u0NI/b
(b) 2u0NI/a
(c) u0NI/2(b-a)In b/a
(d) u0I/2(b-a)In b/a

Answer :

Answer Steps :

step 1:

step 2:

step 3:

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An alternating voltage source is connected in series with a resistance R and an inductance L. If the potential drop across the resistance is 200 V and across the inductance is 150 V, then the applied voltage is:

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