• Shuffle
Toggle On
Toggle Off
• Alphabetize
Toggle On
Toggle Off
• Front First
Toggle On
Toggle Off
• Both Sides
Toggle On
Toggle Off
Toggle On
Toggle Off
Front

### How to study your flashcards.

Right/Left arrow keys: Navigate between flashcards.right arrow keyleft arrow key

Up/Down arrow keys: Flip the card between the front and back.down keyup key

H key: Show hint (3rd side).h key

A key: Read text to speech.a key

Play button

Play button

Progress

1/94

Click to flip

### 94 Cards in this Set

• Front
• Back
 in in which direction is the magnetic field electrostatics says that there are electric charges but in magnetism, there is no? fundamental magnetic charge magnetic fields are created by? moving electric ch, currents in wires, and permanent magnets magnetic fields exert forces on? moving charges, currents in wires, and permanent magnets B is a? fixed and uniform magnetic field si unit of magnetic field is? Tesla Testla=? N(s)/m(C) small magnetic fields are measured in? gauss 1 tesla= __________ Gauss 10^4 gauss a charge moves in a magnetic field F from the magnetic field=? F=qvBsinθ F=qvBsinθ what is B the strength of the magnetic field when a charge moves parallel or antiparallel to a magnetic field the magnetic force is? zero if a charge moves at θ=0 or 180 to a mag field what happens? mag force is zero F = qvB sinθ what is θ? θ is the smallest angle betw the vectors qv and B F = qvB sinθ what is q? q is the charge of the moving particle for determining direction of mag force if q is nonzero and positive ch, then the vector qv _________ as v points in the same direction mag force if q is nonzero and neg ch, then the vector qv _________ as v points in opposite direction ch in a magn field if q or v is zero then the magnetic force? is zero the direct of the magn force will be ________ to the plane defined by qv and B perpendicular right handed rule for magn the ________ of the right hand points in direction of the vector qv (if q is positive) thumb right h rule the thumb of the right hand points in ? direction of qv (if q is positive) right handed rule the thumb of rh points in dir of qv, and the fingers point in direct of? of B ch in magn field right th points in dir of qv, fingers point in dir of B, and _________ shows you direct of F which way the palm faces right handed rule for magn thumb is? fingers are? palm is? thumb is qv fingers are B palm is F- magn force on q magn field symbol x means? a field going into the page. x represents the tail end of an arrow going into the page magn field symbol  represents? a field coming out of the page it represents the tip of an arrow coming out of the page Suppose a proton, whose charge is +1 .6 x 10-19 C, is moving with a speed of 15 m/s in a direction parallel to a uniform magnetic field of 3.0 T. What is the magnitude and direction of the magnetic force on the proton? since qv and B are parallel the angle is 0 and the sin of 0 is 0 so force is zero F = qvB sin 0 Suppose a proton whose charge equals +1 .6 x 10-19 C is moving with a speed of 15 m/s toward the top of the page and through a uniform magnetic field of 3.0 T directed into the page. What is the direction of the magnetic force on the proton? the direction of the F is to the left Remember the direction of the magnetic force on a negative charge is? opposite the direction of the force on a positive charge moving in the same direct as the negat one when a ch particle moves perpend to a const uniform magn field the resulting motion is? circular motion w a const speed in a plane perpend to mag field charg part mov perp to magn field the centripetal force is the? magnetic force F=qvBsin90 (sin90 is 1) charg part mov perp to magn field F=qvB= ? F=qvB=mv^2/r ch part in a magn field F=qvB=mv^2/r you can use this to solve for what? orbit radius, mang field, etc r=mv/qB B=mv/qr Suppose the proton of the previous example is allowed to circle (counterclockwise) in the same perpendicular magnet- ic field of 3.0 T with the same speed of 15 m/s. What is the orbit radius r? (The mass of a proton is 1.67 x 10-27 kg.) what equation will you use? r=mv/qB for a given field direction, if positive charges circle clockwise, then negative charges circle? counterclockwise electric current when 2 points at different __________are connected w a conductor, charge flows betw the 2 points electric potentials magnitude of current is? the amount of charge i=Δq/Δt current is in the directions that? positive ch would flow t or f current is in the direct that posit ch would flow t si unit of current is? ampere ampere is the si unit of? current 1A= ? 1 coulomb/second 1 c/s= 1 A since electrons are negativ cha they go from _________ potent to ___________ potent low to high potential by convent direc of current is direct posit ch would flow which is from ________ potent to __________ potent high to low force on current carrying wire due to magn field F=? F=iLBsinθ force on current carrying wire due to magn field iLBsinθ is equal to what? the F due to the magnetic field right hand rule for force on a current carrying wire in a magn field thumb of rh points in? DIRECTION of current i right hand rule for force on a current carrying wire in a magn field fingers of rh point in? direction of B right hand rule for force on a current carrying wire in a magn field right hand rule thumb? fingers? palm? thumb- direct of i fingers- direct of B palm- F - the magn force on current carrying wire Suppose a wire of length 2.0 m is conducting a current of 5.0 A toward the top of the page and through a 30 Gauss uni- form magnetic field directed into the page. What is the direction of the magnet- ic force on the wire? force on wire is to the left Suppose a wire of length 2.0 m is conducting a current of 5.0 A toward the top of the page and through a 30 Gauss uni- form magnetic field directed into the page (see figure 7.3(a)). What is the magnitude and direction of the magnet- ic force on the wire? what do you need to watch out for? to convert gauss into tesla 1 T= 10^4 Gauss 10^4 Gauss= __________ Tesla 10^4 Gauss= 1 Tesla if a wire has no current moves thr a magnetic field what happens? nothing. wires w no curr are electric neutral. no magn force is generated Suppose a wire of length 2.0 m is conducting a current of 5.0 A toward the top of the page and through a 30 Gauss uni- form magnetic field directed into the page. What is the magnitude and direction of the magnet- ic force on the wire? set up equation F = iLB sinθ = iLB =5.0(2.0)(3.0)X 10-3) any moving charge creates a? magnetic field differ ways to gener a magn field? 1. flow of ch in perman magn 2. electric curr 3. indiv moving ch it is the _____________ that gives rise to the magnetic field movement of ch magnetic field lines magnetic field is ____ to the magn field line at any point tangent _____________ can be used to visualize the magnetic field magnetic field lines magn materials are classified as? 1. diamagnetic 2. paramagnetic 3. ferromagnetic diamagnetic material are? indiv atoms have no net magn field. will be repelled from pole of a strong bar magn. called weakly antimagnetic which magnetic material is weakly antimagnetic? diamagnetic in a ______________ the individ atoms have no net magn field diamagnetic material paramag material is _____________ magnetic weakly in paramag and ferromagnetic mat the indiv atoms do have a ? net magn field but they are randomly oriented so net magn field. ferromagnetic materials below the critical temperature called _______ can dev a higly aligned magn field Curie temperature above the Curie temp the ferromagnetic material is ? paramagnetic _________ are called strongly magnetic ferromagn t or f iron, nickel, and cobalt are ferromagnetic t when the north pole of a compass magnet points along local field lines of earths mag field it is pointing? towards a magnetic south pole on earth, what we call the northern direction is really? the direction of a magn south pole what is the name of the critical temp below which a paramagn mater bec ferromagn? curie temperat north pole is place where magnetic field lines? emerge south pole is where magn field lines? enter the _________ pole is where magnetic field lines emerge north the _______________ pole is where magnetic field lines enter south t or f a current carrying wire will prod a magnetic field in its vicinity t the mag f of a curr carrying wire is the _______ of the magn f due to indiv moving ch of the curr vector sum an infinitely long str wire w curr B= B= µoi/2πr µo is the permeability of free space = 4π X 10-⁷ Tesla∙meter/ampere what are the units of µo? Tesla∙meter/ampere µo= =4π X 10-⁷ Tesla∙meter/ampere =1.26 X 10-6 T∙m/A for a long str wire the magn field strenght __________ with distance drops off magnetic field lines __________ currents encircle current carrying wire right hand rule right thumb is? fingers? right thumb is in direct of current fingers curl in direction of generated mag field B A straight wire carries a current of 5 A toward the top of the page. What is the direc- tion of the magnetic field at point P, which is 10 cm to the left of the wire? B is coming out of the page. magn field at the center of a circular loop of curr carrying wire of radius r is? B=µoi/2r B=µoi/2r only gives the magnetic field at? one point in space, the point at the center of the loop Suppose a wire is formed into a loop that carries current clockwise (that is, electrons flow counterclockwise) Find the direction of the magnetic field pro- duced by this loop: a. within the loop. b. outside of the loop. a. into the page b. outside the loop. B will point out of the page. out of the page A negative charge placed in an external magnetic field circulates counterclockwise in the plane of the paper as shown below. In which direction is the magnetic field pointing? downward, dont forget its an electron so its opposite. If, as in the accompanying figure, an electron is travelling straight out of the page crossing a magnetic field that is directed from left to right, in which direction will the electron be deflected? yes, F=iLB so the wider the pole face, the more wire that is in the magnetic field and the force can be stronger A long straight wire carrying current I is placed between the poles of a horseshoe magnet as shown in the figure below. Does the force on the wire depend on the width of the pole faces, and if so then why? Assume that the strength of the field is independent of the width of the pole faces. A positively charged particle enters a region with a uniform electric field, as shown, and is initially moving perpendicular to the field. In what direction must a uniform magnetic field be oriented so that the net force on the particle is zero (assuming that the strength of the magnetic field can be appropriately adjusted)? heading out of the page, it will creat a magnetic force F=qvBsin angle downwards, electric field is creating a force pushing the charge up