An electron is moving in a circular path under the influence of a transverse magnetic field of 3.57 x 10^-2 T. If the value of e/m is 1.76 x 10^11 C kg-1, the frequency of revolution of the electron is

Question:

Options :

(a) 6.82 MHz
(b) 1 GHz
(c) 100 MHz
(d) 62.8 MHz

Answer :

(b) 1 GHz

Answer Steps :

step 1:

step 2:

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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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