Electrical Engineering - Inductors - Discussion

Discussion :: Inductors - General Questions (Q.No.5)

5. 

The voltage across a coil when di/dt = 20 mA/s and L = 8 H is

[A]. 16 mV
[B]. 160 mV
[C]. 1.6 mV
[D]. 2.5 mV

Answer: Option B

Explanation:

No answer description available for this question.

Deepika said: (Jun 29, 2011)  
Given inductance = 8*10^-6henry. { Henry symbol is H }

and also di/dt means given change of current 20*10^-3amperes.

Current is measured in amperes. Inductance is measured in henry.

To find the voltage L *di/dt = 8*10^-6*20*10^-3/10^-6

= 160*10^-3

= 160mv

voltage is measured in volts.

Deepika said: (Jun 29, 2011)  
Given change of current di/dt = 20*10^-3amperes./10^-6 s

Inductance = 8*10^-6henry.

To find voltage = L*di/dt = 8*10^-6*20*10^-3/10^-6

= 160*10^-3 v.

= 160 milli volts.

Bala said: (Sep 11, 2011)  
Thanks deepika.

Mahesh said: (Feb 17, 2015)  
V = LDI/DT.
= 8*20.
= 160.

Pavan said: (Oct 14, 2015)  
Inductor stores energy in the form of electromagnetic field.

Output Voltage can be varied when current through it will change with time t. So v = L*di/dt.

Pramod said: (Feb 8, 2016)  
Given data,

Rate of change of current = 20 mA/micro sec.

Inductor = 8 microhenry.

From the formula:

Voltage across inductor (V) = L * Rate of change of current,

So, V = 8*20 = 160 mv.

Stuti said: (Feb 15, 2016)  
V = LDI/DT.

= 8*10^-6*20*10^-3/10^-6.

= 160*10^-3v.

Dinesh said: (Aug 12, 2016)  
Helpful solution, Thank you all.

Ravi said: (Feb 3, 2017)  
Thank you @Pramod.

Krushnapada said: (Apr 22, 2017)  
We all know that the formula of the inductor for finding voltage. Is Ldi/it.
So data given,
L = 8*10^-6 H.

di/DT=20*10^-3/10^-6.
So according to formula.
V = 8 * 10^-6 * 20 * 10^-3/10^-6.
= 160*10^-3v.

Priyanka said: (Jul 23, 2018)  
V = Ldi/dt,
= 8 * 20.
= 160V.

Ram said: (Sep 11, 2018)  
v = Ldi/dt.
= 8 * 20.
= 160V.

Engr.Talha said: (Sep 24, 2020)  
Why we are dividing it by 10^-6? Please explain about it.

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