50. An oscillating voltage of fixed amplit across a circuit element. If the freq

Question

50. An oscillating voltage of fixed amplit across a circuit element. If the frequenc increased, the amplitude of the current will (a) More than one of the above is possible, de is applied y of this voltage is depending on a circumstances (b) decrease if the circuit element is either an inductor or a capacitor. (c) decrease if the circuit element is an inductor, but increase if the circuit element is a capacitor. (d)increase if the circuit element is an inductor, but decrease - d 22 if the circuit element is a capacitor. (e) increase if the circuit element is either an inductor or a m capacitor. 04 of s? le, ed, let,

Explanation / Answer

50.

Current in a oscillating voltage circuit is given by:

i = V/Z

Z = impedance = XL OR XC, depending on the circuit element,

if circuit element is inductor, then

Z = XL = w*L = 2*pi*f*L

So now if frequency is increased then impedance will also increase,

Now we know that

i = V/Z

since Z is increased, So current will decrease.

Now in when circuit element is capacitor

Z = Xc = 1/(w*C) = 1/(2*pi*f*C)

So now if frequency is increased then impedance will also decrease,

Now we know that

i = V/Z

since Z is decreased, So current will increase.

From above scenarios correct option will be C.

Decrease if the circuit element is inductor, and increase if the circuit element is capacitor.

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