Electromagnetic Field Theory An insulated metal sphere of 20 cm diameter is charged by rubbing with charges 2 × 10-8 C. Potential developed will be 0 V. 200 V. 900 V. 1800 V. 0 V. 200 V. 900 V. 1800 V. ANSWER DOWNLOAD EXAMIANS APP
Electromagnetic Field Theory Magnetic circuit with cross sectional area of 20 cm2 is to be operated at 50 Hz from 120 Vrms supply. The number of turns required to active a peak magnetic flux density of 1.8 T in the core flux is 150. 450. 300. 600. 150. 450. 300. 600. ANSWER DOWNLOAD EXAMIANS APP
Electromagnetic Field Theory Two coupled coils with L1 = L2 = 0.6 H have a coupling coefficient of K = 0.8. The turns ratio N1/N2 is 2. 4. 0.5. 1. 2. 4. 0.5. 1. ANSWER DOWNLOAD EXAMIANS APP
Electromagnetic Field Theory If n is the polarization vector and k is the direction of propagation plane electromagnetic wave, then n = - k. n = K. n × k = 0. n. k = 0. n = - k. n = K. n × k = 0. n. k = 0. ANSWER DOWNLOAD EXAMIANS APP
Electromagnetic Field Theory A rectangular loop in the x – z plane bounded by the lines x = 0, x = a, z = 0 and z = b is in a time varying magnetic field is given by B = B0 cosωt + ay. Where B0 is constant, ω is angular frequency and ay unit vector in the y direction. Now the emf induced in the loop is given by Bo ω sinω t. abω Bo sinω t. ab Bo cosω t. Zero. Bo ω sinω t. abω Bo sinω t. ab Bo cosω t. Zero. ANSWER DOWNLOAD EXAMIANS APP
Electromagnetic Field Theory When a conductor moves in the field, so that it makes an angle 8 with the lines of flux, the force F is given as : F = Bl sin2 0. Yes No Yes No ANSWER DOWNLOAD EXAMIANS APP
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