H2P-365

Sinusoidal alternating current

H2 Physics · JC 2 · Hard · Sinusoidal alternating current

An alternating current in a coil is given by

I = 1.2\sin(120t)

, where

I

is in A and

t

in s. Determine the angular frequency

\omega

and the period

T

of the current.

$\omega = 120\,\text{rad s}^{-1},\ T \approx 5.2 \times 10^{-2}\,\text{s}$
$\omega = 60\,\text{rad s}^{-1},\ T \approx 1.0 \times 10^{-1}\,\text{s}$
$\omega = 120\,\text{rad s}^{-1},\ T \approx 8.3 \times 10^{-3}\,\text{s}$
$\omega = 240\,\text{rad s}^{-1},\ T \approx 5.2 \times 10^{-2}\,\text{s}$

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