magnetics: ampere law
I have trouble understanding the sign in this problem. I got mu0i/4 but how do we know whether it's positive/negative? Ans key ke acc the ans is correct but has a negative sign.
18 Replies
Thank you for your response @ns.
@Gyro Gearloose
Note for OP
+solved @user1 @user2... to close the thread when your doubt is solved. Mention the users who helped you solve the doubt. This will be added to their stats.i completed the amperian loop like this
and obv since the field is perpendicular to those red lines, b.dl for those lines will be 0
which means b.dl from a to b is mu0/2pi times the angle which is pi/2 rad
can someone plss help
as u can see in image the M.F. lines are in a ciruclr pattern which goes from B pont to A point but question asks line integral from A to B so there will be a negative sign
ohhh okay
thanks a lot @integralofe^2v
i get it
wait dont close
Why can't we do this
initially i got the same ans as u with sign but then this striked me
approximation ??
@integralofe^2v
the problem is probably cuz u cant take dx as rdtheta?
dx= rdtheta seems a bit wrong
the ans does match tho
yeah like the perpendicular u draw on it will be rdtheta.. i guess an additional cos theta component will be there
yes using dx=rdtheta is wrong here its a straight line not curved or anything
hmm
+solved @integralofe^2v
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