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 1800 V. 900 V. 0 V. 200 V. 1800 V. 900 V. 0 V. 200 V. ANSWER DOWNLOAD EXAMIANS APP
Electromagnetic Field Theory The Kirchhoff’s current law is implict in expression Curl of H = J + (δ D)/(δ t). Divergence of D = ρv. Divergence of B = 0. Surface integral of (j.ds) = 0. Curl of H = J + (δ D)/(δ t). Divergence of D = ρv. Divergence of B = 0. Surface integral of (j.ds) = 0. ANSWER DOWNLOAD EXAMIANS APP
Electromagnetic Field Theory An inductor designed with 400 turns coil wound on an iron core of 16 cm2 cross sectional area and with a cut of air gap length of 1 mm. The coil is connected to a 230 V, 50 Hz supply. Neglected coil resistance, core loss, iron reluctance and leakage inductance. Find the current in the inductor. 4.56 A. 9.04 A. 2.28 A. 18.08 A. 4.56 A. 9.04 A. 2.28 A. 18.08 A. 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 A conductor of length 100 cm moves at right angles to a magnetic field of flux density 1.5 Wb/m2 with a velocity of 50 m/s. The induced emf in the conductor will be 50 V. 37.5 V. 150 V. 75 V. 50 V. 37.5 V. 150 V. 75 V. ANSWER DOWNLOAD EXAMIANS APP
Electromagnetic Field Theory Which of the following will increase the antenna radiation efficiency? Any of the above Use of larger section of conductor Providing insulation on conductor Top loading of antenna Any of the above Use of larger section of conductor Providing insulation on conductor Top loading of antenna ANSWER DOWNLOAD EXAMIANS APP
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