Solve Apps: Trigonometric Equations
-A Coil of Wire Rotating in a Magnetic

Multiple Choice

Solve Apps: Trigonometric Equations
-A coil of wire rotating in a magnetic field induces a voltage given by $\mathrm { e } = 20 \sin \left( \frac { \pi \mathrm { t } } { 4 } - \frac { \pi } { 2 } \right)$ , where $\mathrm { t }$ is time in seconds. Find the smallest positive time to produce a voltage of $10 \sqrt { 3 }$ .

A) $3.33$ seconds
B) 3 seconds
C) $3.33 \pi$ seconds
D) $3 \pi$ seconds