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

Physics & Space Science

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An electron is bound in an infinite well (a box) of width 0.10 nm. If the electron is initially in the n = 8 state and falls to the n = 7 state, find the wavelength of the emitted photon

(c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, mel = 9.11 × 10-31 kg)

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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

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Which statement is always correct when applied to a charge distribution located in a finite region of space?

a. Electric potential is always zero at infinity. b. Electric potential is always zero at the origin. c. Electric potential is always zero at a boundary surface to a charge distribution. d. Electric potential is always infinite at a boundary surface to a charge distribution. e. The location where electric potential is zero may be chosen arbitrarily.

Physics & Space Science

Note at least three surface features that are driven by plate tectonics

What will be an ideal response?

Physics & Space Science