Name:

(E(

Student

ID:

__________________

ID:

A

Ph

212/222

Winter

2019

Midterm

2

Rules

•

Record

the

exam

ID

(e.g.

A,

B,

C)

on

your

Scantron

•

No

devices

except

for

standalone

calculators

allowed.

•

One

sheet

of

notes

allowed.

•

Scantrons

must

be

filled

in

with

pencil.

•

Remove

all

items

from

desk

except

for

allowed

materials.

•

You

are

not

allowed

to

leave

the

room

during

the

exam.

•

You

may

write

on

the

exam.

•

Make

sure

name

is

on

exam

and

Scantron.

•

Turn

in

Scantron

and

exam

when

finished.

pico-

(p)

=

1

0

1

2

milli-

(m)

=

10-3

nano-

(n)

=

10"

9

kilo-

(k)

=

10

3

micro-

(u)

=

10-6

centi-

(c)

=

10-2

Multiple

Choice

Identify

the

choice

that

best

answers

the

question.

The

points

for

each

multiple

choice

question

are

marked.

1.

(1

pt)

The

electric

potential

in

a

region

of

space

is

given

by

V(x)

=

50

V

+

(15

V/m)

x.

The

electric

field

in

this

region

is

,

-

a.

50

E=-a4l-

-Bv|w

-

b.

(15V/m)xi

c.

(50

V/m

+15

V/m)

i

d.

(15V/m)

7)

-(15

V/m)

i

2.

(1

pt)

If

the

potential

V

of

an

array

of

charges

vs.

the

distance

from

the

charges

is

as

shown

in

graph

1,

which

graph

shows

the

electric

field

E

as

a

function

of

distance

r?

a.

2

b.

3

e.

6

1