JAMB - Physics (2001 - No. 32)
At reasonance, the phase angle in an a.c. circuit is
90°
60°
0°
180°
คำอธิบาย
At resonance in an a.c. circuit, during which the capacitive reactance X\(_c\) is equal to the inductive reactance X\(_l\), the phase angle Ø = 0°