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Two Concentric circular coils X and Y of radii 16 cm and 10cm lie in the same vertical plane containing N-S direction X has 20 turns and carries 16A .Y has 25 turns & carries 18 A.X has current in anticlockwise direction and Y has current in clockwise direction for the observer, looking at the coils facing the west. The magnitude of net magnetic field at their common center is?

A large circular loop of radius 1 metre has total resistance 4Omega . A variable current is folwing through the loop. The current at any instant is given by equation l = lA, where i is time in second. A very small circular loop or radius 1 cm having resistance 3.14 Omega is placed coaxially with the larger loop at a distance of sqrt3 metre from the centre of larger loop. If induced current in smaller loop is (mu_(0)x xx 10^(-4))/(16) ampere then, find x.

For the circuit as shown in the figure the current through the inductor is 1.6 A, while the current through the condenser is 0.4 A . Then, the current drawn from the source is

Two different coils have self- inductances L_(1) = 16 mH and L_(2)= 12 mH. At a certain instant, the current in the two coils is increasing at the same rate and power supplied to the two coils is the same. Find the ratio of i) induced voltage ii) current iii) energy stored in the two coils at that instant.

An AC source is connected to a capacitor. The current in the current is I. Now a dielectric slab is inserted into the capacitor , then the new current is