Multimeter measures resistance when there’s no battery attached?

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Start date Feb 18, 2009
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Battery Multimeter Resistance

Feb 18, 2009

xswtxoj

How does the multimeter measures resistance when there’s no battery attached?

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Feb 18, 2009

jtbell

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A multimeter has its own battery inside.

Thread 'Free surface problem in electrohydrodynamics'

I'm thinking about the following problem. I have an electrified fluid with a constant charge density,

, within the fluid. Will this necessarily yield a surface charge? Would I have to compute it by looking at the displacement fields on either side of the interface? Would it change if the bulk charge within the fluid remains constant?

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Thread 'Maxwell stress tensor'

This is from Griffiths' Electrodynamics, 3rd edition, page 352. I am trying to calculate the divergence of the Maxwell stress tensor. The tensor is given as

. To make things easier, I just want to focus on the part with the electrical field, i.e. I want to find the divergence of

. In matrix form, this tensor should look like this...

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Thread 'Applying the Gauss (1835) formula for force between 2 parallel DC currents'

Please can anyone either:- (1) point me to a derivation of the perpendicular force (Fy) between two very long parallel wires carrying steady currents utilising the formula of Gauss for the force F along the line r between 2 charges? Or alternatively (2) point out where I have gone wrong in my method? I am having problems with calculating the direction and magnitude of the force as expected from modern (Biot-Savart-Maxwell-Lorentz) formula. Here is my method and results so far:- This...

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Multimeter measures resistance when there’s no battery attached?

Thread 'Free surface problem in electrohydrodynamics'

Thread 'Maxwell stress tensor'

Thread 'Applying the Gauss (1835) formula for force between 2 parallel DC currents'

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