phase angle =
tan-1(Xc-Xl)
where Xc is capacitive reactance and Xl is
inductve reactance.
For zero phase angel Xc = Xl = 7 ohms
Xc is inversely proportional to frequency and Xl is
directly proportional to frequency.
At frequency that is 3.2 time less than frequency, at which phase
angle is zero,
Xc = 7*3.2 = 22.4
Xl = 7/3.2 = 2.2
phas angle = tan-1 ((22.4-2.2)/8 ) = 68.4 deg
Maximum current, Im = Vm/R
                                 Â
= BAnw/RÂ Â ( B is magnetic field, A is area of coil, n is
number of turns)
                            Â
w = Im R/ BAn
                                Â
= 6*2/7.3x10-3*0.25*29
                                 Â
= 226.7 rad/sec
                             Â
f = w/2 pi = 36.1 Hz
