Qualification > Sciences

P.H.Y.S.I.C.S P2 D.O.U.B.T.S CIE

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ruby92:
m/j 2006 7 a b c
if the lamp that shorted is C
so shouldnt the resistance of one of the normal lamps be 30?

zxcvbnm:
november 05, question 5, c ii

Chingoo:
^would help if my Physics was good enough.

Please explain in DETAIL May/June 2009 Paper 21 Question 7 (in attachment)? I suck at these questions, in-depth explanation would be loved. Thanks in advance!

astarmathsandphysics:
m/j 2006 7 a b c
if the lamp that shorted is C
so shouldnt the resistance of one of the normal lamps be 30?
no is 15 cos when S_1 is closed and other two open Resistance is 15

astarmathsandphysics:
november 05, question 5, c ii
sum of two amplitudes is A/3
square to get I/9

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