Homework Help: Physics - electricity

Posted by Damilola on Tuesday, April 17, 2007 at 3:34am.

A thermo junction of iron and copper connected to a galvanometer cannot be used to measure temp above about 450K, whereas one of iron-constantan may be used to at least 875K. What is the explanation?

Is it possible that melting at the junction point is a limiting factor?

Physics - electricity - Anonymous, Thursday, October 4, 2007 at 8:52pm
Trying to find the charge on a balloon that has a radius of 10cm. It attracts circle of paper, r=3mm with a thickness of .1mm. They come together when the balloon got with 10cm.

It attracts circles of tin foil when the balloon got within 20 cm. Tin foil circles, r=1mm and thickness=.01mm.
Thanks

Answer this Question

Related Questions

science - why is copper used for electrical wiring? The have writen 'Copper ...
Physics - Two scales on a voltmeter measure voltages up to 20.0 V and 27.0 V, ...
Physics - The coil of wire in a galvanometer has a resistance of RC = 78.0 &...
chem - how would you find the ratio of moles of copper produced to moles of iron...
physics (thanks) - in the context of the loop and junctions rules for electrical...
Chemistry - A 67gr mass of solid iron is heated by a flame until the temp of the...
physics - The emf of a battery is equal to its terminal potential difference: A...
chemistry - Suppose that you have an unlimited supply of copper 2 chloride to ...
chemistry - Suppose that you have an unlimited supply of copper 2 chloride to ...
chemistry - what changes in colour of iron nails and copper sulphate solution do...

For Further Reading

First Name:
School Subject:
Answer: