Electrical Engineering - Inductors - Discussion

Discussion :: Inductors - General Questions (Q.No.6)

6. 

A sine wave voltage is applied across an inductor. When the frequency of the voltage is decreased, the current

[A]. is increased
[B]. is decreased
[C]. does not change
[D]. momentarily goes to zero

Answer: Option A

Explanation:

No answer description available for this question.

Santosh Kumar said: (Mar 4, 2011)  
When frequency decrease indultance also decrease and so current increase.

Abdul Rauff said: (Dec 14, 2011)  
Xl = jwL = j*2*pi*f*L
so when f decreases ,Xl decreases and current increase

Md Jamshed Nausherwan said: (Mar 27, 2012)  
I=v/Xl, so XL=6. 8fl, thats why frequency reducing current will be increased.

Sumeet Kumar said: (Apr 28, 2012)  
In pure inductor
I=V/XL,whereXL is inductive reactance
XL=2pifl

As f decreases XL also decreases thus I(CURRENT) increases

Vijay Krishna said: (Dec 21, 2012)  
We know that as inductance decreases then current increases. Also
Since Xl=2*3014*l*f. As frequency decreases inductance also decreases.

Muhammad Yaqub said: (Apr 5, 2013)  
XL and current are inversely proportional, and XL=2pi fL so when frequency decreases current will increases because they are inversely proportional.

Upendra said: (Dec 2, 2014)  
Sinusoidal signal means A.C source so impudence present in circuit so inductive reactance is inversely proportional to voltage and directly proportional to current then current increases.

Taniya said: (Feb 11, 2015)  
We know that, inductance opposes the flow of current. Therefore if inductance decreases by decreasing frequency, then current will increase, since the opposition (inductance) has decreased.

Er.Pankaj Pandey said: (Feb 12, 2015)  
We know that inductance is a function of frequency which is directly proportional. If f increase then inductance increase. But I is inversely proportional to inductance. So I will increase when f decrease.

Amit Patel said: (Jun 24, 2015)  
V=Vmsin2pi.ft.

When the frequency is decrease than voltage is also decrease, so current will not be change.

Dhiraj said: (Jul 24, 2015)  
When the frequency decreases, means AC is converted to DC, the inductor act as short circuit in DC. That's the reason when frequency reduces current increase.

Stuti said: (Feb 15, 2016)  
We know,

XL = 2f*3.14l.

So if frequency decrease then XL also decease by which opposition of current also decrease and more current flow therefore current increase.

Rafiq said: (Sep 10, 2016)  
Current increases because it is inversely proportion to the inductive reactance.

Raf said: (Sep 10, 2016)  
@Taniya is right.

Bhargav said: (Dec 8, 2016)  
Frequency decreased means time period increases. Hence voltage decreases. Therefore current decreases.

Albert said: (May 25, 2017)  
Yes, You are right @Bhargav.

Kamlesh Yadav said: (Sep 8, 2017)  
Here, f proportional to V/I.
Then f decreases with increases I.

D Shwetha said: (Sep 8, 2018)  
@Sumeet.

Your explanation is good.

I=V/XL,
I=V/2πfL,
If Frequency decrease, I will increase.

Shivu said: (Sep 22, 2019)  
Current will remains the same, because inductor which opposes the change of current.

Abbas said: (Oct 5, 2020)  
If xl= 2p then it will increases.

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