$a^{\frac{?}{NU}S\text{:}}$

Signature: $q,$

$(2$pts$)$ The three loops of wire shown in the figure are all subject to the same uniform magnetic field $B$ that jos not vary with time. Loop $1$ oscillates back and forth as the bob in a pendulum, loop $2$ rotates about a riduced in the and loop $3$ oscillates up and down at the end of a spring. Which loop, or loops, will have an emf induced in them? Circle your answer.

A$)$ loop $1$ only

B$)$ loop $2$ only

C$)$ loop $3$only

D$)$ loops $1$ and $2$

E$)$ loops $1$ and $3$

F$)$ loops $2$ and $3$

G$)$ loops $1,2$ and $3$

$(4$ pts$)$ A wire is bent into the shape of a circle of radius $r=0\mathrm{.}10m$ and carries a $20\mathrm{.}0-$ A current in the direction shown.

I. What is the direction of the magnetic field at the center of the loop? $($circle answer$)$

a$)$ to the right of the page

b$)$ to the left of the page

c$)$ toward the top of the page

d$)$ into the plane of the paper

e$)$ out of the plane of the paper

II$.$ What is the magnitude of the magnetic field at the center of the loop?