An ac series circuit consists of a voltage source, an 880- ...

[james9437]

An ac series circuit consists of a voltage source, an 880- resistor, and an inductance L. (There is no capacitance in the circuit.)
 
  The current amplitude is 0.60 A, and the phase angle between the source voltage and the current has a magnitude of 41.
  (a) Does the source voltage lag or lead the current?
  (b) What is the voltage amplitude of the source?

Question 2

Suppose that in a parallel universe, the proton and electron were identical to their counterparts in our own universe EXCEPT that the electron had twice as much charge as our electron.
 
  In our present universe, the radius of the first Bohr orbit for hydrogen is a0 and the speed of an electron in that orbit is v0. In the parallel universe
  (a) what would be the radius (in terms of a0 ) of the first Bohr orbit for hydrogen?
  (b) what would be the speed (in terms of v0 ) of an electron in the first Bohr orbit for hydrogen?

[DylanD1323]

Answer to Question 1

(a) The source voltage leads the current.
(b) 700 volts

Answer to Question 2

(a) a0/2 (b) 2v0

[james9437]

Wow, this really help

[Joy Chen]

Thanks for the timely response, appreciate it