chapter 21 Problem 21.42 Resources K previous | 11 of 14 | next, Problem 21.42 |

Question

chapter 21 Problem 21.42 Resources K previous | 11 of 14 | next, Problem 21.42 | B= 0.117 T A solenoid 30.0 cm long and with a cross-sectional area of 0.500 cm contains 400 turns of wire and carries a current of 70.0 A Submit My Answers Give Up Correct Part B Calculate the energy density in the magnetic field if the solenoid is filled with air 5.473 10 Submit My Answers Give Up Incorrect; Try Again; 4 attempts remaining Part C Calculate the total energy contained in the coil's magnetic field (assume the field is uniform). Submit My Answers Give Up Part D Calculate the inductance of the solenoid.

Explanation / Answer

(B) energy density = B^2 / (2 u0)

= (0.117^2) / (2 x 4pi x 10^-7)

= 5447 J/m^3

(C) U = (5447)(0.30)(0.50 x 10^-4)

U = 0.0817 J

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