A circular coil (radius = 0.25 m) has 143 turns and is in a uniform magnetic field. If the orientation of the coil is varied through all possible positions, the maximum torque on the coil by magnetic forces is 0.29 N?m when the current in the coil is 2.7 mA. What is the magnitude of the magnetic field?
a. 5.47 T
b. 0.304 T
c. 3.83 T
d. 137 T
c
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(c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, mel = 9.11 × 10-31 kg)
If the Hubble constant is 25 km/s per million light-years, use it to estimate the age of the universe? (c = 3.00 × 108 m/s, 1 ly = 9.461 × 1015 m, 1 y = 3.156 × 107 s)
A) 15 Gy B) 10 Gy C) 20 Gy D) 12 Gy E) 25 Gy
Which statement is always correct when applied to a charge distribution located in a finite region of space?
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Note at least three surface features that are driven by plate tectonics
What will be an ideal response?