IGCSE/GCSE/O & A Level/IB/University Student Forum

Qualification => Subject Doubts => GCE AS & A2 Level => Sciences => Topic started by: halosh92 on December 02, 2009, 04:21:52 pm

Title: physics doubt!!!!!!!!!!!!!!!!!!!!!!!!!
Post by: halosh92 on December 02, 2009, 04:21:52 pm

HEY
i have a doubt in physics CIE ASlevel
OCT/NOV 2008
QP 2
Q 7b  2nd part.

Title: Re: physics doubt!!!!!!!!!!!!!!!!!!!!!!!!!
Post by: astarmathsandphysics on December 02, 2009, 06:40:37 pm

In 3 hours

Title: Re: physics doubt!!!!!!!!!!!!!!!!!!!!!!!!!
Post by: astarmathsandphysics on December 02, 2009, 10:23:01 pm

voltage across 5000 ohm resistor is 6-3.6=2.4V
resistance of 5000 ohm resistor -thermistor combination =2.4/3.6*2000=4000/3 ohms
1/R=1/R1+1/R2
3/4000=1/5000+1/R2
1/R2=3/4000-1/5000=11/20000
r2=20000/11 ohms

Title: Re: physics doubt!!!!!!!!!!!!!!!!!!!!!!!!!
Post by: halosh92 on December 03, 2009, 07:29:30 am

Quote from: astarmathsandphysics on December 02, 2009, 10:23:01 pm

voltage across 5000 ohm resistor is 6-3.6=2.4V
resistance of 5000 ohm resistor -thermistor combination =2.4/3.6*2000=4000/3 ohms
1/R=1/R1+1/R2
3/4000=1/5000+1/R2
1/R2=3/4000-1/5000=11/20000
r2=20000/11 ohms

 thankx alot!!!