Question

A proton is moving in a circle due to an external magnetic field of 8 mT. What radius is this circle if the proton is traveling at 4e5 m/s?

3.89 m

None of the above

3.2 mm

0.52 m

1.92 m

A wire is carrying 2 mA of current in a direction into the page. What is the magnitude and direction of the magnetic field 3 cm to the right of the wire?

4.19e-8 upwards

1.33e-8 T downwards

1.83e-8 T upwards

None of the above

4.97e-8 downwards

How many total turns does a 20 cm long solenoid need in order to generate a magnetic field of 1 μT when 3 mA is running through the solenoid?

53

382

18

265

None of the above

A circuit has a resistor with resistance equal to 8 Ω, a capacitor with capacitance 746 μF, and an inductor with inductance 8e-4 H. What is the total impedance of the circuit if the frequency of AC is 23 Hz? (10 points)

19.44 Ω

12.16 Ω

9.36 Ω

10.60 Ω

None of the above

How much charge is necessary for a point charge to generate an electric potential of 6 kV at a distance 2 m from the point charge?

None of the above

8.32e-4 C

3e-6 C

3e3 C

1.33e-6 C

What is the force on a proton which is 5 nm from an electron?

3.28e-9 N

5.76e7 N

None of the above

4.62e-20 N

9.23e-12 N

What is the critical angle for light leaving glycerin (n=1.473) and entering water (n=1.33)?

Doesn’t exist

76.21 degrees

64.54 degrees

None of the above

25.45 degrees

Answer 1