1) A loop of area 0.250 m^2 is in a uniform 0.020 T magnetic field. If the flux

Question

1) A loop of area 0.250 m^2 is in a uniform 0.020 T magnetic field. If the flux through the loop is 3.83 x 10 ^-3 T m^2, what angle does the normal to the plane of the loop make with the direction of the magnetic field?
a) 40
b) 50
c) 37.5
d) This is not possible

2) A coil in a magnetic field encloses a flux of 0.256 T m^2 when the angle between the normal to the coil and the direction of the magnetic field is 70.0 degrees. What flux would go through the coil if the angle were changed to 40.0 degrees?
a) 0.332 T m^2
b) 0.198
c)0.114
d)0.573

Explanation / Answer

Equation: I = BAcos? 1) 3.83E-3 = .02(.25)cos? cos? = .766 ? = cos-1 (.766) = 40 degrees Choice A 2) Let BA = X .256 = Xcos70
X = BA = .748 Now solve for I: I = .748cos40 I = .573 Choice D

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