Electromagnetism

What does a rheostat control?

What does Rheostat controls? electron drift velocity or quantity of electrons? Rheostat

We know I=nAve
I=current
n=quantity of electron
A=conductor area
e=electron charge
v=drift velocity

(Asked  Partha)

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Be the first to comment - What do you think?  Posted by admin - June 30, 2012 at 5:51 pm

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Collection of Problems received from Class 12 Physics

These problems were posted by Geena. Hope that we will be able to post the answers to these questions soon; each in a separate post. By the time visitors can attempt to post their answers as comments to this post. (Only selected posts will be published)   Please note that the answers are not published until the [...]

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Be the first to comment - What do you think?  Posted by Mathew Abraham - September 13, 2011 at 7:16 pm

Categories: Ask Physics, charge density, Electromagnetism, Interesting Questions, potential drop, Project, time answers   Tags: , , , , , , , , , , , , ,

Direction of magnetic field due to a current carrying conductor

“How do we know the direction of magnetic field around the current carrying conductor?” Asked Nikhil Incoming search terms:direction of magnetic field around a current carrying conductorDIRECTION OF MAGNETIC FIELD IN CURRENT CARRYING CONDUCTORmagne...

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Be the first to comment - What do you think?  Posted by Mathew Abraham - September 10, 2011 at 10:55 am

Categories: Ask Physics, Current Electricity, Electromagnetism, Magnetism, Project   Tags: , , , , , , , , , , , , ,

CERN Large Hadron Collider

Why is the Large Hadron Collider as large as it is?  I heard today that the actual accelerator portion is only 40 Meters long, the rest is (mostly) magnets that steer the particles, so why does the accelerator need to be 17 miles in circumference?  Does making it larger provide any advantages?   (asked Rick) Incoming search terms:cerncern [...]

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Be the first to comment - What do you think?  Posted by Mathew Abraham - September 3, 2011 at 1:31 pm

Categories: accelerator, Ask Physics, circumference, Collider, Electromagnetism, Interesting Questions, large hadron, Meters, Project, rest   Tags: , , , , , , , , , , ,