In a physics laboratory experiment, a coil with 150 turns enclosing an area of 1

Question

In a physics laboratory experiment, a coil with 150 turns enclosing an area of 13.8 cm2 is rotated in a time interval of 4.30×102 s from a position where its plane is perpendicular to the earth's magnetic field to one where its plane is parallel to the field. The earth's magnetic field at the lab location is 6.4×105 T .

Part A

What is the total magnetic flux through the coil before it is rotated?

Part B

What is the total magnetic flux through the coil after it is rotated?

Part C

What is the average emf induced in the coil?

Explanation / Answer

Part A

i = NB•dA

= 150(6.4x105T)(0.00138m2)=1.3248 x10-5TM2

partB

f = NBcos90A = 0 (the total magnetic flux through the coil after it isrotated is 2 = NBAcos (here =900 ) so 2 = 0 )

Part C

the change in flux is d = 2 -1 = - NBA the average emf induced in the coil is = -d /dt = NBA / dt calculate for
=(/t) = ((1.3248 x 10-5)/(4.30×10^2)) = 3.080 x 10-4volts

where is the total change in magnetic flux through each loop, N is the total number of loops, and t is the time interval over which this change occurs

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