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Re: A MC question on EM Induction



The ballistic galvanometer relies on this effect to measure a total charge
transfer. The governing equation is Delta Q = Delta Phi/R. So long as it
is "fast enough" the total time is irrelevant to the measurement.

A "flip coil" connected to a calibrated ballistic galvanometer uses this
effect (in "reverse") to measure the B field.

Bob Sciamanda (W3NLV)
Physics, Edinboro Univ of PA (em)
trebor@velocity.net
http://www.velocity.net/~trebor
----- Original Message -----
From: "Fakhruddin, Hasanbhai" <hfakhrud@BSU.EDU>
To: <PHYS-L@lists.nau.edu>
Sent: Friday, April 19, 2002 11:55 AM
Subject: A MC question on EM Induction


This question occured to me while doing demostration that involves
dropping a magnet through a PVC pipe. An emf is induced in a coil of wire
around the pipe and LED's light up.

Question:

If the magnet fell FASTER through the coil the total charge flowing
through the coil due to the induced current will

(A) Increase
(B) Derease
(C) Not change

-Hasan Fakhruddin
The Indiana Academy for Science, Mathematics, and Humanities