Recent content by Murgs2012

That's how we'd find the charge density Rho isn't it? But that's only part of the question, it was how to know if it was an electrostatic field that was annoying me

Lenz’ Law (1845): “The voltage (emf) induced by a changing flux has a polarity such that the current flowing gives rise to a flux which opposes the change of flux” emf= rate of change of magnetic flux from Faraday's law of induction, then Lenz' law says it is negative so that the emf created...

So for that equation in an electrostatic field ∇xE=0, and that would be the way to determine if it's electrostatic or not? If it's electrostatic would you then use Gauss' law ∇.E=ρ/ε to find the charge density that creates this field. If it's not electrostatic would the non zero result...

Homework Statement Any ideas on the way to approach them problems would be appreciated really. Homework Equations Assuming it has something to do with ∇.E=ρ/ε or ∫E.ds=Q/ε to see if the divergence of the E fields given satisfy them conditions, if not use ∇xE=-dB/dt or...

No idea, downside of university "problems "(past paper in this case) are the lack of answers because they love repeating questions across years :\. But if we both got to the same answer I'll take it as right :) Thanks for the help.

Oh sorry, just re-did it and got 1.5005m?

so would i be correct in saying that because it is moving at non-relativistic speeds (0.025c) the length contraction is effectively zero so the proper length and the contracted length are both 1.5m?

Homework Statement An observer at a station on the moon measures the time of a spacecraft passing with constant speed v. The front of the spacecraft passes him at 0 s and the rear at 0.2 μs. The observer measures the length of the spacecraft to be 1.5 m. Explain briefy the term...

heres my next go at it... 1. Homework Statement A refrigerator is to freeze 150g of water at 0°c in one minute, the ambient temperature being 20°C. Calculate in Watts the minimum power required? So known stuff: mass of water =0.15kg Temp of cold reservoir= 273k Temp of warm reservoir= 293k...

Delete i wrote it down wrong.

1. Homework Statement A refrigerator is to freeze 150g of water at 0°c in one minute, the ambient temperature being 20°C. Calculate in Watts the minimum power required? So known stuff: mass of water =0.15kg Temp of cold reservoir= 273k Temp of warm reservoir= 293k Specific heat capacity...