Question 1

The magnetic field B is defined in terms of $F_B$ acting on a test particle with q moving the field with velocity v is given by

Accepted Answer

$F_B = qv$x$B$

Answer

$F_B = qv$.$B$ (dot product)

Answer

$F_B = qv$$B$

Answer

$F_B = \frac{qv}{B}$

Question 2

Opposite magnetic poles ____ each other.  Like magnetic poles _____ each other.

Accepted Answer

attract; repel

Answer

repel; attact

Answer

repel; repel

Answer

attract; attact

Question 3

What is the force on a charge Q that is placed at rest in a uniform magnetic field that points in the positive x - direction.

Accepted Answer

$0$ No force unless the charge is moving

Answer

$q/B$

Answer

$qB$

Answer

$q^2B$

Question 4

The direction on the force on the charge -q is directed

Accepted Answer

- x direction

Answer

+ x direction

Answer

+y direction

Answer

+ z direction

Question 5

Magnetic field lines go from ____ to ____

Accepted Answer

North Pole to South Pole

Answer

South Pole to North Pole

Answer

negative to positive

Answer

positive to negative

Question 6

A charge Q = 5C is directed in the +x direction into an uniform magnetic field $B=5T$ that is pointed in the +y direction.  The work done by the magnetic field in 3 seconds is

Accepted Answer

0 magnetic field does no work on a charged particle

Answer

5J

Answer

15 J

Answer

-15J

Question 7

A proton is traveling in the direction of the B field.  The force acting on the proton is directed in what direction.

Accepted Answer

There is no force since v is parallel to B

Answer

+y direction

Answer

into the page

Answer

out of the page

Question 8

an electron is traveling up the plane of the page.  What is the force experienced by the electron if the B is directed to the right

Accepted Answer

out of the page

Answer

- x direction

Answer

+ x direction

Answer

into the page

Question 9

In a cross field of an electric field and magnetic field.  A charged particle with velocity $v$ will pass through the region if which of the following is true

Accepted Answer

$v =\frac{E}{B}$

Answer

$v= EB$

Answer

$v =\frac{B}{E}$

Question 10

If a charged particle enters a mass spectrometer the particle will immediately

Accepted Answer

be deflected into a circular path

Answer

continue traveling straight

Answer

will be slowed down by the B-field.

Answer

with be slightly deflected in the upward direction

Question 11

A particle with mass $m$ and charge $q$ enters a into a mass spectrometer with B-field $B$.  It will have a circular path with radius

Accepted Answer

$r = \frac{mv}{qB}$

Answer

$r = \frac{qB}{mv}$

Answer

$r = \frac{mB}{qv}$

Answer

$r = \frac{mv^2}{qB}$

Question 12

The period of a charged particle with mass m and charge q that enters a mass spectrometer with magnetic field B is

Accepted Answer

$T=\frac{2\pi m}{qB}$

Answer

$T=\frac{2\pi m}{qv}$

Answer

$T=\frac{2\pi r}{qB}$

Answer

$T=\frac{2\pi m}{vB}$

Question 13

If a charged particle enters a region of magnetic field and the particle's velocity is not perpendicular to the magnetic field then the path will be

Accepted Answer

helical along the direction of the B-field

Answer

it will continue on a straight path (No force_

Answer

circular around the B-field

Answer

it will come to a stop

Question 14

A charged particle with an energy of 5 eV (electron volts) has how many joules of energy

Accepted Answer

$5$ x ($1.6$x$10^-19$) J

Answer

$5^2$ x ($1.6$x$10^-19$) J

Answer

$5$ x ($1.6$x$10^-27$) J

Answer

$\frac{5}{(1.6 x 10^-19)}$ J

Question 15

The force on a current carrying wire of length L and current $i$that is placed uniform magnetic field $B$ is given by

Accepted Answer

$F$= $iL$x$B$

Answer

$F$= $i^2L$x$B$

Answer

$F$= $iL$x$B^2$

Answer

$F$= $i$x$B$

Question 16

The direction of the B - Field is

Accepted Answer

-y direction

Answer

+y direction

Answer

+ z direction

Answer

+ x direction

Question 17

The torque on a current carrying loop of wire in a uniform magnetic field is proportional to

Accepted Answer

The area of the loop of wire in the magnetic field

Answer

Its not proportional to it

Answer

the length of wire in the magnetic field

Question 18

The direction of the force on the charged particle is

Accepted Answer

+ z

Answer

+y

Answer

+ x

Answer

-z

Question 19

A metal strip is moved up with velocity v through a uniform magnetic field directed into the plane of the page.  Which of the following is true about the potential values at x and y?

Accepted Answer

$Vx - Vy > 0$

Answer

cannot be determined

Answer

$Vx - Vy < 0$

Answer

$Vx - Vy = 0$

Question 20

A metal strip of width $d$ is moved up with velocity $v$ through a uniform magnetic field $B$ directed into the plane of the page.  What is the magnitude of electric potential difference, $V$, between x and y once equilibrium is established.

Accepted Answer

$V = Bvd$

Answer

$V = Bvd^2$

Answer

$V = \frac{Bv}d$

Answer

$V = Bv^2d$

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