Friday
May 24, 2013

# Posts by Spencer

Total # Posts: 159

please look at my earlier question below thank you

physics EM
nvm found it elsewhere. turns out i had my calc in degrees instead of radians. dont you just hate when that happens.

physics EM

physics EM
ok for dB/Dt I get .18025cos(2pift). for induced emf its Area*dB/dt*N(turns). ive tried it with a problem I know and it works fine. at the end do i just plug in the given t into the equation. Please could you work it out i think its calculation but i cant find it. I use B=(u*N...

physics EM
A 59.0 -turn, 4.10-cm-diameter coil with R = 0.530 {\Omega} surrounds a 1.70-cm-diameter solenoid. The solenoid is 21.0 cm long and has 170 turns. The 60 Hz current through the solenoid is I_sol = (.470A)*sin(2*pi*f*t). I guess f is the frequency. Find the value of I_coil, the...

physics EM
thats what i thought. so i thought it would be abc. but then wouldnt moving it in the direction of the b field cause more lines to pass in less time? Ive tried abcdf, abcf,abc,c, none of those work.

physics EM
the image is a square loop on the xy plane with the B field directed into the page. that should help. Im pretty sure moving it right wont do anything because same number of field lines passing. Im not sure if changing the magnitude does anything.

physics EM
Ive tried multiple answers but cant get it right. Which of the following changes would induce an electromotive force (emf) in the loop? When you consider each option, assume that no other changes occur. a. The magnitude of B_vec increases. b. The magnitude of B_vec decreases. ...

physics EM repost
ok i got it finally. thanks

physics EM repost
to find N is it L/2d? length being length of solenoid and d is diameter of the wire or solenoid?

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