DC vs Step Change Current: Which Induces More Current?

[liam1992]

Which can induce more current in a conductor, a DC current of 50V 10A or a step change from 1mA to 3mA?

I thought that in a DC circuit the inductor would not induce a voltage as V=L(δI/δt) where (δI/δt) is 0 for a DC circuit. But then some websites that I have looked at say differently so I'm a bit confused. The question doesn't give me enough information to use any of the equations that I have been taught so could you please tell me how to sove this problem. Thank you.

 

[rude man]

Try Farady's and Ampere's laws ...

 

[liam1992]

Try Farady's and Ampere's laws ...

Surely I don't have enough information to apply either of these laws though

 

[NascentOxygen]

The arrangement is of two parallel wires, is it? When the current in one of them matches what you describe, what happens in the other wire? Is that the question?

 

[liam1992]

The arrangement is of two parallel wires, is it? When the current in one of them matches what you describe, what happens in the other wire? Is that the question?

I don't know, that statement is all that I was given so I don't know if I am supposed to make assumptions or not.

 

[NascentOxygen]

The arrangement is of two parallel wires, is it? When the current in one of them matches what you describe, what happens in the other wire? Is that the question?

I don't know, that statement is all that I was given so I don't know if I am supposed to make assumptions or not.

Well, with such scanty specifications, maybe you are allowed to wave one wire furiously around in the vicinity of the other https://www.physicsforums.com/images/icons/icon5.gif

 

[rude man]

Surely I don't have enough information to apply either of these laws though

Ah, but you do!

 

[liam1992]

Ah, but you do!

I thought you needed the length of the wire and radius to work out the magnetic field strength and things

 

[rude man]

I thought you needed the length of the wire and radius to work out the magnetic field strength and things

Not in this case.

Hint: one's a dc current, one is time-varying. Then think about Messrs. Faraday and Ampere.