A long straight wire carries a current $I$. Which of the following graphs best represents the magnitude of the magnetic field $B$ as a function of the distance $r$ from the wire?
Question 2
A circular loop of wire of radius $R$ carries a current $I$. What is the magnitude of the magnetic field at the center of the loop?
Question 3
Two long, parallel wires are separated by a distance $d$. Wire 1 carries a current $I_1$ and Wire 2 carries a current $I_2$. If the currents are in opposite directions, what is the nature of the magnetic force between the wires?
Question 4
A solenoid of length $L$ has $N$ turns and carries a current $I$. Which of the following actions would increase the magnetic field strength inside the solenoid?
Question 5
The Biot-Savart Law is used to calculate the magnetic field produced by a current element. Which of the following correctly represents the direction of the magnetic field $d\vec{B}$ due to a current element $I d\vec{l}$?
