The Earth\'s magnetic field in Idaho, USA points downward into the ground at an

Question

The Earth's magnetic field in Idaho, USA points downward into the ground at an angle of 69 degree below the horizontal and has a strength of 5.9 times 10^-5 T. What is the magnetic flux through 1.0 m^2 of ground in Idaho? A circular loop of conducting wire is placed in a magnetic field of 0.40 T while the free ends of the wire are attached to a 15 omega resistor as shown in the figure. When you pull on the loop, the area of the loop is increased at a constant rate from 100 to 200 cm^2 in 0.020 seconds. What are the magnitude and direction (left or right) of the current in the resistor?

Explanation / Answer

23-1)

B = 5.9 x 10^-5 T,

= 69°

A = 1 m^2

Magnetic flux formula is given by

B = B A Cos

B = 5.9 x 10^-5 x 1 x Cos(69)

= 2.1143 x 10^-5 Wb

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