Physics 212 Final Sample Exam Form A 1 A point charge q is located at position A a distance r away from a point charge Q The charge q is moved to position B which is also located a distance r away from the charged particle Q Which of the following statements is correct A The work done by the electric field in moving the charged particle from A to B is kQq WAB 2r B The work done by an outside force in moving the charged particle from A to B is kQq WAB 2r C The work done by the electric field in moving the charged particle from A to B is WAB 0 D The work done by the electric field in moving the charged particle from A to B is kQq WAB r E The work done by an outside force in moving the charged particle from A to B is kQq WAB r 2 A very small styrofoam sphere with charge 2C is held 1 mm above the center of a charged conducting sheet of size 1 m x 1 m The sphere experiences a repulsive force of 2 N What can we say about the local charge density at the center of the sheet A B C D E The local charge density is 8 85 x 10 12 C m2 The local charge density is 8 85 x 10 12 C m2 The local charge density is 1 12 x 10 11 C m2 The local charge density is 1 77 x 10 11 C m2 We cannot say anything since we don t have enough information about the charge distribution on the sheet Page 1 Physics 212 Final Sample Exam Form A 3 The figure shows 3 extremely long straight parallel wires carrying currents of equal magnitude in the directions indicated What is the direction of the net force on the wire located at the origin A B C D E Parallel to the vector Parallel to the vector Parallel to the vector Parallel to the vector The net force is zero x y x y x y x y 4 The light bulbs in the circuit are identical When the switch is closed A B C D E both bulbs go out the intensity of light bulb A increases the intensity of light bulb A decreases the intensity of light bulb B increases nothing changes Page 2 Physics 212 Final Sample Exam Form A 5 The figure shows a phasor diagram for a series RLC circuit Which of the following statements is correct Note that the figure is drawn to scale A The drive frequency is below the resonance frequency V1 is the voltage drop across the resistor V2 is the voltage drop across the inductor and V3 is the voltage drop across the capacitor B The drive frequency is below the resonance frequency V1 is the voltage drop across the inductor V2 is the voltage drop across the resistor and V3 is the voltage drop across the capacitor C The drive frequency is above the resonance frequency V1 is the voltage drop across the resistor V2 is the voltage drop across the inductor and V3 is the voltage drop across the capacitor D The drive frequency is above the resonance frequency V1 is the voltage drop across the inductor V2 is the voltage drop across the resistor and V3 is the voltage drop across the capacitor E The drive frequency is above the resonance frequency V1 is the voltage drop across the capacitor V2 is the voltage drop across the resistor and V3 is the voltage drop across the inductor 6 A capacitor is fully charged using a battery of EMF E It is then disconnected from the battery and connected across an inductor in an ideal LC circuit Which of the following statements is correct A The capacitor and the inductor will dissipate the same non zero amount of energy in each cycle of oscillation B The value of the inductor determines the value of the maximum charge stored on the capacitor C The value of the maximum charge stored on the capacitor determines the value of the maximum current through the inductor D When the current in the LC circuit is zero there is no charge on the capacitor E The EMF of the battery determines the amount of energy dissipated in each cycle of oscillation Page 3 Physics 212 Final Sample Exam Form A 7 In the circuit shown the switch is closed at t 0 Which of the graphs below correctly represents the current in the 20 resistor as a function of time The origin of the each graph is 0 0 A B C D E A B C D E Page 4 Physics 212 Final Sample Exam Form A 8 In the figure the magnetic field within the circular area is into the page is uniform and is increasing at a constant rate The magnetic field outside the circular area is zero Use Faraday s Law to determine which graph correctly depicts the magnitude of electric field E r where r is the distance from the center of the circle The radius of the circular area is R A E r r R A B C D E B E r r r R C E r r r R E r r A B C D E 9 What is the value of the current i5 in the following configuration i1 6A i2 7A i3 6A i4 6A A B C D E 13 A 1 A 1A 13 A 25 A Page 5 D r R E r r E r R r Physics 212 Final Sample Exam Form A 10 The Curie temperature of iron is around 800 C Which of the following statements is correct A B C D E Iron is a ferromagnet above 800 C Iron is a paramagnet below 800 C Iron is a superconductor above 800 C Iron is a ferromagnet below 800 C Iron is a ferromagnet at all temperatures 11 On a computer chip two conducting interconnects carry charge from P to Q and from R to S If the current direction is reversed in both wires the net magnetic force of strip 1 on strip 2 A B C D E remains the same reverses changes in magnitude but not in direction changes to some other direction none of the above 12 A battery establishes a steady current around the circuit below A compass needle is placed successively at points P Q and R The relative deflection of the needle in descending order is P Q R A B C D E P Q R Q R P R Q P P R Q Q P R Page 6 Physics 212 Final Sample Exam Form A 13 A capacitor resistor and inductor are connected in parallel across an ac source of EMF given by E Emsin t A student constructs a phasor diagram representing the currents in the three components labelled as IC IR and IL for the capacitor resistor and inductor respectively Which of the figures below could correctly depict a phasor …