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Chapter Questions
Find the magnetic field at $0.255 \mathrm{m}$ from a long wire carrying a current of $1.38 \mathrm{A}$.
Find the magnetic field at $0.365 \mathrm{m}$ from a long wire carrying a current of $8.95 \mathrm{A}$.
What is the current in a wire if the magnetic field is $4.75 \times 10^{-6} \mathrm{T}$ at a distance of $1.75 \mathrm{m}$ from the wire?
A solenoid has 2000 turns of wire, is $0.452 \mathrm{m}$ long, and carries a current of $4.55 \mathrm{A}$. What is the magnetic field at the center of the solenoid?
A solenoid has 2750 turns of wire and is $0.182 \mathrm{m}$ long. What current is required to produce a magnetic field of $0.235 \mathrm{T}$ at the center of the solenoid?
A power line running north-south carrying 500 A is $7.00 \mathrm{m}$ above a transit used by a surveyor. What error is induced in the compass used by the surveyor? (Assume the earth's horizontal component of magnetic field is $5.20 \times 10^{-5} \mathrm{T} .$ )