Faraday CT s F 1 A bar magnet is inside an imaginary closed surface S What can you say about the magnetic G G v B dA is flux through the surface dA S S A zero B positive C negative D impossible to tell from the information given F 2 A square loop of area A is in a constant uniform magnetic field In which situation is the magnetic flux through the loop the smallest A area A edge on constant uniform B field B area A face on D Same flux in all three C area A tilted N F 3 A loop of wire is moving rapidly through a uniform magnetic field as shown True A or False B there is a non zero emf induced in the loop F 4 A loop of wire is spinning rapidly about a stationary axis in uniform magnetic field as shown True A or False B there is a non zero emf induced in the loop F 5 The magnetic flux through a loop of wire is shown At which point is the magnitude of the emf induced in the loop a maximum flux D C time B A F 6 A loop of wire is sitting in a uniform constant magnet field as shown Suddenly the loop is bent into a smaller area loop During the bending of the loop the induced current in the loop is A zero B in B clockwise C counterclockwise B in F 7 A bar magnet is positioned below a horizontal loop of wire with its North pole pointing toward the loop Then the magnet is pulled down away from the loop As viewed from above is the induced current in the loop clockwise or counterclockwise eyeball N A clockwise B counterclockwise S F 8 A square loop is rotating in a fixed external magnetic field into the page At the instant shown the loop is out of the plane of the page with left side of the loop above the page and coming out of the page the right side in going in The direction of the induced current is axis of rotation B in A C Neither B F 9 A long straight wire carrying an increasing current I passes along a diameter of a wire loop The straight wire and the loop are in the same plane but are not in electrical contact No electrical contact between loop and straight wire The induced current in the loop is A zero B counter clockwise loop C clockwise I increasing F 10 A loop of wire is near a long straight wire which is carrying a large current I which is decreasing The loop and the straight wire are in the same plane and are positioned as shown The current induced in the loop is A counter clockwise B clockwise C zero I to the right but decreasing loop F 11 Two loop of wires labeled A and B are placed near each other as shown A large current I in loop A is suddenly turned on This causes an induced current in loop B which causes A A net replusive force the two loops repel B A net attractive force the two loops attract C whether the force is attractive or repulsive depends on whether the current in first loop is CW or CCW D No net force F 12 A wire loop moving right enters a region where there is a constant uniform magnetic field pointing into the page B As the loop enters the B field the current induced in the loop is A CW B CCW As the loop enters the B field the direction of the net force on the loop is A right B C up D down E there is no net force F 13 The vertical wire shown is moving to the right in a uniform magnetic field which is into the page There is a current upward meaning that there is a flow of electrons downward The fixed positive ions in the wire are moving to the right along with the wire The negative conduction electrons are moving to the right and down What is the direction of the net magnetic force on this segment of the wire A Up B Down C Left conventional current I D Right E None of these B in uniform motion of wire and of fixed positive ions electron current motion of conduction electrons in wire F 14 An electric motor consists of a coil free to turn on an axis and located in an magnetic field B created by an arrangement of permanent magnets With the current and field directions as shown which way will the coil rotate A CW axis B B I A B B CCW C the coil won t rotate when at this particular orientation F 15 A solenoid has an increasing current causing an increasing Bfield in its interior An end on view of the solenoid is shown below A proton is directly below the solenoid While the current I in the solenoid is increasing what is the direction of the force on the proton A B in D B C proton E E field is zero so force is zero Hint What is the direction of the E field at the position of the proton Think Lenz s Law F 16 A long solenoid of radius R contains a uniform magnetic field B which is increasing at a steady rate B t C t where C is a constant For distances r R from the center of the solenoid how does the magnitude of the Electric field depend on r z G G Hint E d l d dt ez G G B da j A E zero R B E 1 r C E r D E r2 E E r3 B r F 17 A rectangular loop is placed in a uniform magnetic field with the plane of the loop perpendicular to the direction of the field If a current is made to flow through the loop in the sense shown by the arrows the field exerts on the loop B I A a net force only B a net torque only C a net force and a net torque D neither a net torque nor a net force F 18 A transformer is connected to a battery as shown The voltage difference across the resistor R is B V N1 N2 C V A V N2 N1 D zero E not enough information to answer V N2 N1 R iron core F 19 The primary coil of a transformer is connected to a battery a resistor and a switch The secondary coil is connected to an ammeter When the switch is thrown closed the ammeter shows A a zero current all the time B a non zero current for a brief time when the switch is closed C a steady non zero current after the switch is closed V A R iron core F 20 A step down transformer is attached to an AC voltage source and a resistor as shown How does the current in the …
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