The energy stored in an inductor of inductance 5mH when a current of 6A flows through it is?
A. 9.0 x 10-3J B. 9.0 x 10-2J C. 1.4 x 10-2J D. 1.8 x 10-3J Correct Answer: Option B – 9.0 x 10-2J Explanation Energy stored in a coil of inductance, L, and carry a current, I is given by Energy stored in a coil of inductance, L, and carry a current, I is given...
Flourescent tubes produces light by the?
A. excitation of gas molecules B. conduction of solar energy C. refraction of light by gas molecules D. thermal agitation of electron in the tubes Correct Answer: Option A – excitation of gas moleculesX rays can be used in the study of crystal structure because they?
A. have a very long-reaching wavelength B. have extremely short wavelength C. are invisible D. are very fast Correct Answer: Option B = have extremely short wavelength
For semi conductor to have negative temperature coefficient of resistance implies that?
A. their resistance decrease with temperature B. The resistance increase with temperature C. their resistance is constantly changing with temperature D. they have electrons and holes at high temperature Correct Answer: Option A – their resistance decrease with...
An a.c circuit of e.m.f 12V has a resistor of resistance 8Ω connected in series to an inductor of inductive reactance 16Ω and a capacitor capacitive reactance 10Ω. The current flow in the circuit is?
A. 1.4A B. 1.2A C. 12.0A D. 14.0A Correct Answer: Option B – 1.2AProducts
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