Name What is the value of a capacitor with 250 V applied and has 500 pC of charg
ID: 2293638 • Letter: N
Question
Name What is the value of a capacitor with 250 V applied and has 500 pC of charge? (a) 200 puF (6) 0.5 pF (c) 500 ?F (d) 2 pF 7. 8. If a 50 mH inductor has 100 of energy stored in it, what constant current is flowing through it? (a) 2 mA (b) 0.1 mA (c) 2 HA (d) 10 mA Which of the following describes the action of a capacitor? (a) creates a de resistance (b) converts ac into de 9. (c) opposes changes in the flow of current (d) stores electrical energy 10. Coils of various dimensions designed to introduce specified amounts of inductance into a circuit are called (a) semiconductors (b) superconductors (c) electromagnets (d) inductorsExplanation / Answer
Question (7)
we know charge Q = Capacitance, C times the Voltage, V
Q = CV = >C =Q/V = 500p / 250 Farad = 2p Farad
Hence Option is d is correct.
Question (8)
The relation between Current flowing in an inductor and the energy it holds is given through,
Energy = 1/2 Inductance times square of current
i.e. E =1/2 L I^2 => Current, I = sqrt(2*E/L) = sqrt(2*100*10^-6/(50*10^-3)) = 0.063 Amperes = 63 mA
Therefore non of the given options is correct.
Question (9)
A capacitor does not create a DC resistance rather it blocks it. So option a is incorrect.
A capacitor does not convert AC to DC. So option b is incorrect.
A capacitor does not oppose the change in the flow of current. An inductor does. A capacitor does not create a DC resistance rather it blocks it. So option c is incorrect.
A capacitor stores the energy in the form of electric field contained in the dielectric medium between its plates.
Therefore d is correct.
Question (10)
Inductors induce inductance into the circuit. i.e an Inductor stores energy in a magnetic field when electric current flows through it.
So option d is correct
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