Qualification > Sciences
ALL CIE PHYSICS DOUBTS HERE !!!
SkyPilotage:
Q1.Can someone shed light on the virtual earth approximatio in operatioal amplifiers?
-Is it a rule for all op-amps?
-why does the non-inv input have to be the same as the inv input? i.e why does the diff have to be zero?
Q2.How does reducing the gain cause less distortion, increased bandwidth and stability ?
Thank you in advance.
Physics09:
Thankyou so much!!
But just one thing, how is the total resistance 1.5?
SkyPilotage:
Resistors Q and R are parallel with each other! Since they have the same value, the total resistance is halved so its 1/2 R .
Resistor P is in series with the equivalent of both resistors Q and R so The total resistance of the circuit is 1R + 0.5R = 1.5R
Hope it cleared it up.
Physics09:
Oh right!
Thank you!
Rvel Zahid:
hi people need help in some mcq's:-
http://www.xtremepapers.com/CIE/International%20A%20And%20AS%20Level/9702%20-%20Physics/9702_w10_qp_11.pdf
24 and 33.
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