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

Qualification => Subject Doubts => GCE AS & A2 Level => Sciences => Topic started by: ashwinkandel on October 03, 2010, 02:35:57 pm

Title: physics electricity simple question....
Post by: ashwinkandel on October 03, 2010, 02:35:57 pm: 30 The current in a component is reduced uniformly from 100 mA to 20 mA over a period of 8.0 s.
What is the charge that flows during this time?
A 160mC B 320mC C 480mC D 640mC
Title: Re: physics electricity simple question....
Post by: S.M.A.T on October 03, 2010, 05:12:44 pm: current=0.5×(100+20)×8=480mC
since uniformly so the graph is like this:
Title: Re: physics electricity simple question....
Post by: elemis on October 03, 2010, 05:14:07 pm: There's no graph :P
Title: Re: physics electricity simple question....
Post by: Vin on October 03, 2010, 05:16:28 pm: Quote from: Ari Ben Canaan on October 03, 2010, 05:14:07 pm
There's no graph :P

He's on it man. Wait for it. :P :P
Title: Re: physics electricity simple question....
Post by: S.M.A.T on October 03, 2010, 05:18:39 pm: Quote from: Ari Ben Canaan on October 03, 2010, 05:14:07 pm
There's no graph :P

Vin is right i was working on it ;)
Title: Re: physics electricity simple question....
Post by: elemis on October 03, 2010, 05:26:12 pm: +rep ;D
Title: Re: physics electricity simple question....
Post by: S.M.A.T on October 03, 2010, 05:34:27 pm: thanks bro ;D ;D
Title: Re: physics electricity simple question....
Post by: ashwinkandel on October 03, 2010, 05:39:26 pm: thanks bro +rep
Title: Re: physics electricity simple question....
Post by: S.M.A.T on October 03, 2010, 05:49:13 pm: thank u ;D
Title: Re: physics electricity simple question....
Post by: Deadly_king on October 04, 2010, 10:30:45 am: Quote from: asiftasfiq93 on October 03, 2010, 05:12:44 pm
current=0.5×(100+20)×8=480mC
since uniformly so the graph is like this:

Good job asif..........except that the current does not decrease to zero when t = 8s as shown by your graph :P
Title: Re: physics electricity simple question....
Post by: S.M.A.T on October 04, 2010, 11:41:41 am: Quote from: Deadly_king on October 04, 2010, 10:30:45 am
Good job asif..........except that the current does not decrease to zero when t = 8s as shown by your graph :P

my graph is correct see it carefully ::).....i used straight line at t=8s because i don't know how to use dot-line in the paint editor :P
Title: Re: physics electricity simple question....
Post by: Deadly_king on October 04, 2010, 12:08:40 pm: Quote from: asiftasfiq93 on October 04, 2010, 11:41:41 am
my graph is correct see it carefully ::).....i used straight line at t=8s because i don't know how to use dot-line in the paint editor :P
Ooh.......you should have specified :p