The coil of a moving iron instrument has a resistance of 500 Ω and an inductance of 1 H. It reads 250 V when a 250 V dc is applied. If series resistance is 2000 Ω, its reading when fed by 250 V, 50 Hz ac will be

The coil of a moving iron instrument has a resistance of 500 Ω and an inductance of 1 H. It reads 250 V when a 250 V dc is applied. If series resistance is 2000 Ω, its reading when fed by 250 V, 50 Hz ac will be

A magnetic circuit shown in Fig. 5 has an iron core with a relative permeability of 1000and a 500 turn coil wound on the iron core. Find the current i in the exciting coilrequired to establish a flux of 100µWb in the air gap

n a coil of resistance 100  a current is induced by changing the magneticflux through it. The variation of current with time is as shown in the figure. Themagnitude of change in flux through coil is(a) 200 Wb (b) 275 Wb (c) 225 Wb (d) 250 Wb

A square-wave voltage of 100V with frequency of 60Hz is applied on a coilwound on a closed iron core. The coil has 500 turns, and the cross-section areaof the core is 0.001m2. If the core has no resistance, determinea) the maximum value of flux;b) the maximum value of voltage with the maximum flux density of 1.2T

A coil induces 350 mV when the current changes at the rate of 1 A/s. The value of inductance is:a.350mHb.250mHc.150mHd.3,500mH