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13 votes

Do moving charges still generate an electrostatic field?

When we speak of a current-carrying wire, we usually mean a wire that is electrically neutral (as most wires are). There are as many positive charges as there are negative charges. The net charge is ...
Vincent Thacker's user avatar
8 votes

Do moving charges still generate an electrostatic field?

The phrasing of your professor's question is unclear, as it talks about an infinite line of current, which is, ofc, charged. So the implication in the question is: There are two linear charge ...
JEB's user avatar
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6 votes

Do moving charges still generate an electrostatic field?

Yes, a single moving charge does produce an electric field as well as a magnetic field (although it isn’t really correct to describe that electric field as “electrostatic”). But a typical current-...
tparker's user avatar
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4 votes
Accepted

Can resistors having equal magnitudes of potential difference be considered to be in parallel?

All three resistors have one end connected to A and the other to B, so they are all in parallel.
my2cts's user avatar
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2 votes

Why is current the same when batteries are connected in series?

I struggle to understand why the current remains the same when batteries are connected in series. The same as what? The same as when the two batteries are connected in parallel? That premise of your ...
KDP's user avatar
  • 5,349
2 votes
Accepted

Getting conserved current from electromagnetic field-strength tensor

Your problem boils down to proving the formula $$\vec{\nabla} \cdot \frac{\vec{x}}{|\vec{x}|^3} = 4 \pi \delta^{(3)}(\vec{x}) \tag{1} \label{1}$$ in the framework of the theory of distributions. Eq. \...
Hyperon's user avatar
  • 6,596
1 vote

Why is current the same when batteries are connected in series?

First, when we say "the current is the same when batteries are connected in series" we mean that the current through battery 1 is the same as the current through battery 2. We don't mean ...
The Photon's user avatar
1 vote
Accepted

In an infinite square grid of resistors, why isn't current distributed equally at adjacent node of current injection?

The fact that the points have equal resistances between them is clearly not sufficient for them to be equivalent to each other. The equivalence depends on the entire circuit. This is true even in ...
Vincent Thacker's user avatar
1 vote

How to find current direction from voltage value?

How to find current direction from voltage value? From the voltage values alone, no, not in every circuit. If your circuit contains only linear resistive elements or is operating in DC steady state ...
The Photon's user avatar

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