Magnetic Fields & Electromagnetism

Parallel to the wire

Radially inward toward the wire

Radially outward away from the wire

In a circle around the wire

$1.0 \times 10^{-5} , T$

$2.0 \times 10^{-5} , T$

$3.0 \times 10^{-5} , T$

$4.0 \times 10^{-5} , T$

Midway between the wires

At a point very far away from both wires

Nowhere; the magnetic field is never zero

At a point on the line connecting the wires, closer to the wire carrying the smaller current

The magnetic field is strongest at the center and decreases towards the ends.

The magnetic field is strongest at the ends and decreases towards the center.

The magnetic field is uniform throughout the interior of the solenoid.

The magnetic field oscillates between strong and weak regions inside the solenoid.

$1.26 \times 10^{-3} , T$

$2.51 \times 10^{-3} , T$

$3.77 \times 10^{-3} , T$

$5.03 \times 10^{-3} , T$

The magnetic field is uniform throughout the toroid.

The magnetic field is proportional to $r$.

The magnetic field is proportional to $1/r$.

The magnetic field is proportional to $r^2$.

A square loop with the wire at its center

A rectangular loop with the wire along one of its sides

A circular loop centered on the wire

Any closed loop will work equally well

A square loop because it's easy to calculate the area.

A circular loop because the magnetic field is constant along the loop.

A rectangular loop because it can enclose more current.

Any loop will work as long as it encloses the current.

A circular loop of radius $r$ centered in the slab

A rectangular loop of width $2r$ and length $L$ inside the slab, parallel to the current

A square loop with sides of length $2a$

Any loop that encloses the entire slab

0 T

$3 \times 10^{-6} , T$

$6 \times 10^{-6} , T$

$12 \times 10^{-6} , T$