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This is the Past Paper of General Physics which includes Momentum Conserved, Motion of Objects, Different Paths, Relative Speeds, Conservative Force, Mass of Spring Board, Kinetic Energy, Gravitational Potential Energy etc. Key important points are: Lenz Law, Uniform Magnetic Field, Magnetic Flux, Direction of Magnetic Field, Current Induced in Coil, Negative Sign, Faraday's Law, Amp Ere's Law, Cylindrical Coil of Length, Inductance of Solenoid
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St. Vincent College PH 112: General Physics II
The exam consists of 4 questions. The questions may not be worth the same number of points, read the entire exam before beginning work. Put your name on all pages.
Problem 1 30 Problem 2 30 Problem 3 20
Problem 4 20
Total 100
a) (5 pts) A loop of wire is placed in a uniform magnetic field. For what orientation of the loop is the magnetic flux a maximum?
b) (5 pts) A thick wire loop is placed around a solenoid, as shown in the figure below. Initially, there is no current flowing in the solenoid. However, when the solenoid is connected to a battery, current starts to flow in the direction indicated by the two arrows. Indicate, on the drawing, the direction in which current is induced in the thick loop of wire around the solenoid.
c) (5 pts) Current is initially flowing to the right through the long, straight, thick wire shown in the figure below. Indicate, on the diagram, the direction of the magnetic field produced by this current through the loop of wire containing the resistor. Also indicate the direction of the induced current in the wire loop with the resistor if the current in the thick wire is decreasing.
a) (10 pts) Use Amp`ere’s Law to determine the magnetic field inside the coil when a current I is running through the wire.
b) (10 pts) Compute the magnetic flux through one turn of the coil with the magnetic field you found in (a).
c) (10 pts) Finally, work out the expression for the inductance of the solenoid. Make sure your answer indicates that the inductance only depends on geometric properties of the coil and not on the amount of current flowing through it.
a) (10 pts) Calculate the inductance L in a series RL circuit (like the one we did in class) where R = 0.5 Ω and the current increases to one-fourth its final value in 1.5 s.
b) (10 pts) If the RL circuit is connected to a 12 V battery, how much energy is stored in the magnetic field of the inductor at this point in time?
