Electrical Engineering - Inductors - Discussion

Discussion :: Inductors - General Questions (Q.No.13)


An inductor and a resistor are in series with a sine wave voltage source. The frequency is set so that the inductive reactance is equal to the resistance. If the frequency is increased, then

[B]. VL < VR
[C]. VL = VR
[D]. VL > VR

Answer: Option D


No answer description available for this question.

Seyran said: (Aug 30, 2011)  
With frequency increasing, reactance supposed to be increased as well, it means the right answer is option D.

Sah said: (Oct 10, 2011)  
Xl=2*Pi*f*L, with increase in reactance, voltage is supposed to increase. The correct option can be D. If anyone has alternative please reply.

Sandeep Siet Allahabad said: (Dec 24, 2011)  
As we know that xl=f, so increasing frequency, inductance voltage increase also vl>vr.

Qazi Hashim Jan said: (Jan 24, 2012)  
When the frequency is increased then the impedance X(L) increases and the drop VL across the inductor increases as compared to VR across R.

Bhola said: (Jan 2, 2013)  
As we know Xl=2*pi*f*L. So when f will increase Xl increases and voltage drop through inductance increases (Vl=I*Xl). So Vl must be greater than Vr.

Asr said: (Oct 2, 2016)  
Inductive reactance is directly proportional to frequency xl = 2 * 3.142 * f * l(xl=f).

Santosh said: (Dec 10, 2016)  
If frequency increases, inductance increases.

Arun Kumar M said: (Feb 16, 2017)  
Frequency affects only on inductor XL = 2Pifl in a resistor frequency doesn't affect. If frequency increases VL is greater.

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