A conductor of length 2m carries a current of 0.8A while kept in a magnetic field of magnetic flux density 0.5T. The maximum force acting on it is?
A. 0.2N B. 0.8N C. 3.2N D. 8.0N Correct Answer: Option B – 0.8N Explanation The force on the conductor is maximum when the conductor lies perpendicular to the field during which the maximum force is given as; F = ILB = 0.8 x 2 x 0.5 =...
A cell of internal resistance 1Ω supplies current to an external resistor of 3Ω. The efficiency of the cell is?
A. 25% B. 33% C. 50% D. 75% Correct Answer: Option D – 75% Explanation Efficiency = Output/input x 100/1 Efficiency = 3/(3+1) x 100/1 = 3/4 x 100/1 = 75%
A 2H inductor has negligible resistance and is connected to a 50/π Hz A.C. Supply. The reactance of the inductor is?
A. 200 Ω B. 50 Ω C. 100/π Ω D. 25/π Ω Correct Answer: Option A = 200 Ω Explanation Inductive reactance is given by XL = WL = 2πfL XL = 2 x π x (50/π) x 2 XL = 200Ω
A certain radioactive source emits radiations that were found to be deflected by both magnetic and electric fields. The radiations are?
A. beta rays B. gamma rays C. x-rays D. ultra-violet rays Correct Answer: Option A – beta raysProducts
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