(Figure 1) shows a 1.0-cm-diameter loop with R = 0.50 inside a 2.0-cm-diameter s
ID: 3164197 • Letter: #
Question
(Figure 1) shows a 1.0-cm-diameter loop with R = 0.50 inside a 2.0-cm-diameter solenoid. The solenoid is 8.0 cm long, has 100 turns, and carries the current shown in the graph. A positive current is cw when seen from the left.
Determine the current in the loop at t = 0.010 s?
Express your answer with the appropriate units.
Experiments to study vision often need to track the movements of a subject's eye. One way of doing so is to have the subject sit in a magnetic field while wearing special contact lenses with a coil of very fine wire circling the edge. A current is induced in the coil each time the subject rotates his eye. Consider the experiment shown in the figure in which a 24-turn, 6.0-mm-diameter coil of wire circles the subject's cornea while a 1.0 T magnetic field is directed as shown. The subject begins by looking straight ahead.
What emf is induced in the coil if the subject shifts his gaze by 6 in 0.23 s ?
Express your answer to two significant figures and include the appropriate units.
2.0 cm 1.0 cm (A) r(s) .01 0.02Explanation / Answer
emf E = d flux/dt = A dB/dt
but B comes from solenoid
B = u0 I N/L
there fore dB/dt = u0 N/L dI/dt
from figure dI/dt = 0.5/0.01
emf E = pi*(0.01/2)^2* 4*pi*10^(-7)*100/0.08*0.5/0.01=6.16*10^-6 V
I = emf/R = 6.16*10^-6/0.5=1.23*10^-5 A
hope it works :))
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.