U₁= P Part (i) Calculate the numerical value of U,, in J. Part (j) What's the torque tu now? 11

University Physics Volume 2
18th Edition
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Chapter12: Sources Of Magnetic Fields
Section: Chapter Questions
Problem 88AP: Two long coaxial copper tubes, each of length L, are connected to a battery of voltage V. The inner...
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I am needing help on parts (i) and (j) please 

(11%) Problem 9: A circular coil comprised of N= 130 closely wrapped turns of wire and has a radius R
= 0.45 m. A counterclockwise current I = 2.5 A is in the coil. The coil is set in a magnetic field of
magnitude B = 1.4 T. The magnetic field points to right.
Part (a) Express the magnetic dipole moment, in terms of the number of the turns N, the current I, and radius R.
u=NITR² ✓ Correct!
Part (b) Calculate the numerical value of u in SI units.
μ-206.65
= 206.7
✓ Correct!
Part (c) What is the vector direction of u?
Upward. ✔ Correct!
Part (g) What is the potential energy of the coil in the magnetic field, in terms of the variables provided?
U=0 ✓ Correct!
Part (h) If the magnetic field was pointing upward, express the potential energy of the coil in the magnetic field, U₁, in terms of u and B.
U-B✔Correct!
Part (i) Calculate the numerical value of U, in J.
U₂ =
Tu =
B
Part (j) What's the torque tu now?
Transcribed Image Text:(11%) Problem 9: A circular coil comprised of N= 130 closely wrapped turns of wire and has a radius R = 0.45 m. A counterclockwise current I = 2.5 A is in the coil. The coil is set in a magnetic field of magnitude B = 1.4 T. The magnetic field points to right. Part (a) Express the magnetic dipole moment, in terms of the number of the turns N, the current I, and radius R. u=NITR² ✓ Correct! Part (b) Calculate the numerical value of u in SI units. μ-206.65 = 206.7 ✓ Correct! Part (c) What is the vector direction of u? Upward. ✔ Correct! Part (g) What is the potential energy of the coil in the magnetic field, in terms of the variables provided? U=0 ✓ Correct! Part (h) If the magnetic field was pointing upward, express the potential energy of the coil in the magnetic field, U₁, in terms of u and B. U-B✔Correct! Part (i) Calculate the numerical value of U, in J. U₂ = Tu = B Part (j) What's the torque tu now?
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