Physics 2A Exam 1 and Exam 2

A uniform 1.72 T magnetic filed passes through the plane of a wire loop 0.46 m squared in area. What flux passes through the loop when the direction of the 1.72 T field is at a 38.4 degree angle to the normal of the loop plane.

0.62 T x m squared

A light ray in air is incident on an air-to-glass boundary at an angle of 33 degrees and is refracted in the glass at an angle of 18.5 degrees with the normal. Find the index of refraction of the glass.

1.72

When a 20.8 ohm resistor is connected across a 15.6 volt battery, a current of 500 mA flows. What is the internal resistance of the battery?

10.4 ohm

What is the impedance of an AC series circuit that is constructed of a 12.5 ohm resistor along with 13.6 ohm inductive reactance and 3.43 ohm capacitive reactance?

16.1 ohm

A high-voltage power line 23.0 m above the ground carries a current of 1 200 A. What is the magnetic field due to the current directly underneath the power line? (u0= 4pie-07).

19.1 micro tesla

A 16 ohm wire at 20 degrees celsius with a temperature coefficient of resistivity of 3.9e-03 will have what resistance at 80 degrees celsius?

20 ohm

The index of refraction of the core of a piece of fibre optic cable is 1.86. If the index of the surrounding cladding is 1.33, what is the critical angle for total internal reflection for a light ray in the core incident on the core cladding interface?

45.6 degrees

A rectangular coil (0.13m x 0.98m) has 277 turns and is in a uniform magnetic field of 0.50 T. If the orientation of the coil is varied through all possible positions, the maximum torque on the coil by magnetic forces is 0.096 N x m. What is the current in the coil?

5.4e-03

A proton, mass 1.67e-27 Kg and charge +1.6e-19 C, moves in a circular orbit perpendicular to a uniform magnetic field of 0.86 T. Find the time for the proton to make one complete circular orbit.

7.6e-08 s

A proton (+1.6e-19) moves 20 cm on a path in the direction of a uniform electric field of strength 2.4 N/C. How much work is done on the proton by the electric field?

7.7e-20 J

Two long parallel wires 45.6 cm apart are carrying currents of 13.0 A and 23.0 A in the same direction. What is the magnitude of the magnetic field halfway between the wires.

8.77e-06 T

If a negative charge is placed inside a hollow isolated conductor that is originally neutral and the charge does not touch that conductor at any time:

The inside surface of the conductor will become positively charged.

The current in a long wire creates a magnetic field in the region around the wire. How is the strength of the field at distance r from the wire center related to the magnitude of the field.

field inversely proportional to r

Assume that a uniform magnetic field is directed into this page. If an electron is released with an initial velocity directed from the bottom edge to the top edge of the page, what describes that motion of the magnetic force acting on the electron.

to the right