SJSU Phys 2B Berman

Order of increasing frequency..

...

What is the path of a charged particle q, with mass m moving with constant speed v in a uniform magnetic field B?

A circle of radius R

What is a charge?

A fundamental attribute of matter

What is a test charge?

A small positively charged body

How do you find the electric field produced by two or more charges?

Add electric fields of individual charges as vectors

Loop Rule

Around any closed-circuit loop, the sum of the potential drops equals the sum of the potential rises.

Why do we call an image "virtual?"

Because the reflected rays do not really pass through the point P.

____ moves at the losest speed in a prism when white light disperses through it.

Blue

how do you calculate the net potential of two or more charges?

Calculating the algebraic sum, kq/r1+kq/r2+kq/r3

What causes the flow of charges inside a battery?

Chemical reactions

How do you find the electric flux through a closed surface?

Divide the whole surface into small portions and find the total flux as the sum of fluxes through each portion

How can an lectromagnetic wave be emitted?

EM waves can be emitted by an accelerating charge.

If a proton is released at the equator and falls toward the Earth under the influence of gravity, the magnetic force on the proton will be toward the

East

Two positive point charges Q and 2Q are separated by a distance R. If the charge Q experiences a force of magnitude F when the separation is R, what is the magnitude of the force on the charge 2Q when the separation is 2R?

F/4

True or False: When a charged particle is moving in a uniform, constant magnetic field, the magnetic force exerted on the particle increases the speed of the particle.

False

True or False: a diverging lens can produce a real image.

False

True or false: If an suspended object is attracted to a charged object, then the suspended object is charged.

False

How is it possible to stop emitted electrons?

If a reverse voltage is applied, which is the stopping potential.

What is the direction of the induced current?

Lenz Law: The direction of any magnetic induction effect is such as to oppose the cause of the effect.

In electrostatics, can electric field exist inside a conducting material?

No, the electric field is zero inside a conducting material.

True or False: the voltage between the terminals of the battery are the same as the electromotive force (emf).

No.

An unsymmetrical thin lens forms an image of a point object on its axis. Is the image location changed if the lens is reversed?

No. the focal length and the image formation are determined by refractions on both faces of the lens.

a proton traveling due east in a region that contains only a magnetic field experiences a vertically upward force away from the surface of the earth. What is the direction of the magnetic field?

North

what is a parallel wiring?

The devices are connected in such a way that the same voltage is applied accross each device.

What is the direction of magnetic field?

The direction of the North pole of a compass needle.

What do we call the image of an object?

The image is produced by reflected or refracted rays and is in different place than the actual position of the object.

Faraday's Law of electromagnetic induction

The induced emf in a closed loop equals to the negative of the time rate of change of magnetic flux through the loop.

What is an image point?

The light converges toward or appears to diverge from the image point.

How do you determine the direction of the magnetic force?

The right hand rule.

why are interference patterns not usually observed for light from two ordinary light bulbs?

The two sources are not coherent.

What pushes charges inside wires?

There exists an electric field inside wires created by the potential difference of power supplies.

How does the angle of reflection relate to the angle of incidence?

They are equal and both lie in the plane of incidence.

True or False. The electric force does not do any work as a test charge moves along an equpotential surface.

True

True or False: The magnetic force cannot change the magnitude of the speed of a particle moving in the magnetic field.

True

True or False: the emf in the same coil is induced if the current in a single coil varies.

True

True or False: the force exists on a magnetic field onld if the velocity vector has a component normal to the magnetic field.

True

True or false. A force does not do work if the direction of motion is normal to the force. therefore, the electric field lines are normal to equipotentials.

True

True or false: in LR circuits, the voltage across an inductance is ahead of the current by pi divided by 2.

True

True or False: In a magnetic field, magnetic moments tend to be oriented along the direction of the magnetic field.

True.

What is a series wiring?

Two devices that are connected in such a way that the same current flows through each device.

The unit of an electric potential is a

VOLT

There is no fundamental difference between geometric and _____ optics.

Wave

When do you use the superposition principle?

When three or more charges are present

What is an equipotential surface?

a 3 dimensional surface on which potential V is the same at every point.

What is a motor?

a generator in reverse: the current flows through the loop in the magnetic field, causing the roation of the loop.

What is a ray?

a geometric construction showing the direction of travel of the wave.

What is an electric current?

a motion of charges from one region to another

What is electromagnetic induction?

a phenomenon of producing emf with the aid of a magnetic field.

What is the equopotential surface for a point charge?

a sphere

the path of a charged particle moving parallel to a uniform electric magnetic field will be

a straight line

what is a wave?

a wave is any disturbance from an equilibrium confition that propagates from one region to another.

The heat effect of rms voltage in _______ is the same as in _______.

ac circuis dc circuits

As more slits with the same spacing are added to a multiple-slit system the principal maxima

become narrower

the quantity analogous to resistance in RC circuit is ____ _____.

capacitive reactance

the algebraic sum of all electric charges in any closed system is ____.

constant

When the flux through the loop increases, and the induced emf opposes the increase of the flux , the current will flow _________ to produce magnetic field lines that point out of the plane of the page

counterclockwise

For capacitors in parallel, the charges are _____ between capacitors, but the _____ is the same on both.

divided voltage

The direction of the ____ field is the same as the direction of the force on a ___ test charge.

electric positive

How are different forms of enery converted into emf?

electromagnetic induction

Potential energy

energy associated with the forces of interaction and positions of interacting bodies

What two things do stopping potential depend on?

frequency of incident light material of the emitter

When an object is in ______ of and ____ the focal point of a converging lens, the image is real, inverted, and on the back side of the lens.

front outside

When an object is anywhere in ____ of the diverging lens, the image is virtual, _____, _____ than the object, and on the ____ side of the lens.

front upright smaller front

Initial q is the charge of a ______ ____ _____.

fully charged capacitor.

The capacitance is a ______ ____ of any charged object.

fundamental property

The unit for frequency is in

hertz

When the magnetic field lines due to the current are into the plane of the coil, their number ______; the induced current in the coil ____ the increase of the flux by creating magnetic field lines that point _____________.

increases opposes out of the plane

The light that can undergo interference is evidence that

it behaves like a wave.

Earth is a magnet. What is its magnetic field?

it is of the order of 10e-4 and varies with location.

How can one charge a body?

it is possible to charge a conducting body by contact with another charged object or induction (without contact).

The terminal voltage is affected by both the ____ and the _____ resistance.

load internal

When applying the Coulomb Law, first find the ______ of the _____ force, then find the _____ of the force on each charge.

magnitude electrostatic direction

Where do the excess charges reside?

on the surface of a conductor

When magnetic field lines are into the plane of coil, the induced current ______ the flux, due to an increase of being out of the plane of coil. This results in the current going the ___ direction of the of the

opposes

the radius of curvature is ________ if the center of curvature is on the same side as the incident light.

positive

Considering the magnetic forces acting on moving charges, what is the potential at point A and B?

positve at A negative at B

What do circuits consist of?

power supplies sonsuming devices conducting wires

the equipotential surfaces associated with an isolated point charge are

radially outward from the charge

what is a current?

rate at which the charge flows through a surface

In magnets, like poles _____ and unlike poles _____.

repel attract

Like charges ____. Unlike charges _____.

repel attract

An ohm is a _______.

resitivity

In AC circuits with only resistance, what changes in step with its voltage?

the current

What is dispersion?

the dependence of the index of refraction on the wavelength.

Gauss Law states..

the electric flux through a closed imaginary surface is equal to the charge enclosed divided by the permitivity of free space

What is a back emf?

the emf induced in the loop by the current.

superposition principle

the net force is a vector sum of individual forces

frequency

the number of oscillations per second

What is internal resistance?

the resistance of the inside of a power supply; it is always in series with the power supply.

Electric field lines...

the tangent of the lines gives the direction of the electric field the spacing gives the idea of the magnitude field lines can never cross

Junction Rule

the total current directed into a junction must be equal to the total current directed out of the junction.

What are coherent waves?

the waves of the same frequency emitted by two or more monochromatic sources with constant phase difference.

True or false: a change carrier can be positive or negative.

true

Light from an ordinary source is usually

unpoloarized

What are two possible forms of oppositely charged confductors for capacitors?

vacuum (air) dieletrics between conductors

When the object is between the focal point and a converging lens the image is _____, _____, _____ than the object, and on the ____ side of the lens.

virtual upright front

When light passes from vacuum of one material to another, both properties of _____ and _____ change.

wavlength speed