A thin semicircular conducting ring (PQR) of radius r is falling with its plane vertical in a horizontal magnetic field B, as shown in figure. The potential difference developed across the ring when its speed is v, is

Question:

Options :

(a) πrBv and R is at higher potential
(b) 2rBv and R is at higher potential
(c) Zero
(d) Bvπr2 / 2 and P is at higher potential

Answer :

(b) 2rBv and R is at higher potential

Answer Steps :

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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:

In an a. c. circuit the instantaneous current and e.m.f. are represented as: I = I0 sin(ωt – π/6) and E = E0 sin(ωt + π /3) respectively. The voltage leads the current by

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