Solve the Problem $e = 20 \sin \left( \frac { \pi t } { 4 } - \frac { \pi } { 2 } \right)$

question 145

Multiple Choice

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

• A) \(2.8 \mathrm { sec }\)
• B) \(3 \pi \mathrm { sec }\)
• C) \(2.8 \pi \mathrm { sec }\)
• D) \(3 \mathrm { sec }\)

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