Same as the other post! Any help is appreciated. Test is tomorrow, so please pro

Question

Same as the other post! Any help is appreciated. Test is tomorrow, so please provide a clear explanation on how to solve these. Thank you!

The figure below shows the orientation of a flat circular loop consisting of 50 closely wrapped turns each carrying a current I. The magnetic Md in the region is directed in the positive z direction and has a magnitude of 50 mT, The loop can turn about the y axis. If theta = 20degree, R = 0.50 m, and I=12 A, what m the magnitude of the torque exerted on the loop? 8.1 n.m 24 N.m 22 N.m 13 N.m 16 N.m Find the current through the amrrwt.fr 9.5 mus after the switch in the figure is thrown from position a to position b

Explanation / Answer

9)

no of loops, N = 50

current through the loop, I = 12 A

ara of the loop, A = pi*r^2

= pi*0.5^2

magnetic filed, B = 50 mT

= 50*10^-3 T

Torque on the loop, T = N*I*A*B*sin(theta) (here theta is the angle between normal to the loop and B)

= 50*12*pi*0.5^2*50*10^-3*sin(20)

= 8.1 N.m

1)

when the sitch is moved froma to b,

initially volatge across capacitor = 12 volts

Initial current through resistor,
Imax = 12/15

= 0.8 A

Time constant of the ckt, T = R*C

= 15*1*10^-6

= 15*10^-6 s

at time t,
now Apply, I = Imax*e^(-t/T)

= 0.8*e^(-9.5/15)

= 0.425 A <<<<<<<<---------Answer

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