Instructions: Answer all 15 short questions and 5 of the 7 lettered problems. An
ID: 1515305 • Letter: I
Question
Instructions: Answer all 15 short questions and 5 of the 7 lettered problems. Answers must give correct units and be reasonable as to accuracy. You have been provided a box of 1.0-ohm precision resistors. What is the smallest number of resistors needed for a circuit of 1 4 ohm resistance? 3 pith balls are lined up along the x-axis, 1 cm apart. They are each given a static charge of 1.5 mu C. How much electric energy was expended to bring them together from infinite separation A new type of electrochemical cell has a terminal voltage of 6.000 volts when I ampere flows through it and 5.995 Volts when 2 amperes flow through it. What is the internal resistance of the cell? Two point charges are released from rest They move directly towards each other as a result of their electrostatic attraction. Will they experience a magnetic force as a result? yes/no. A transformer used with Neon signs may have 50 turns for its primary and 2000 turns for its secondary coil. If a 110 rms voltage is applied to its primary coil what will the rms output of the secondary be? If the primary coil of a transformer is connected by mistake to a dc source, what will happen? (a) nothing (b) excessive current will flow in the primary, possibly burning it out (c) excessive current will flow in the secondary. Suppose you have a long straight wire carrying current in the +x direction and a long straight wire carrying an equal current in the +y direction. Then the magnetic field will be zero in the xy plane, along the lines (a) x=y (b)x=-y (c) nowhere. The magnetic force on a charged particle will be non-zero (a) if the particle is moving in the field direction (b) is moving at right angles to the field direction (c) is not moving at all. A particle sent into a magnetic field at right angles with respect to its direction (a) will experience a force perpendicular to its direction of motion and perpendicular to the field direction (b) will experience no force, (c) will experience a force in the direction of the field.Explanation / Answer
4) If there isnt a magnetic field there is no magnetic force present
5) N1/n2=V1/v2
V2=V1n2/N1=110*2000/50=4400 V
8)
F=qv x B if the particle is moving in the same direction as the field there is no magnetic force
9)
F=qv x B. Then if v is perpendicular to B the force is perpendicular to the field direction