how to measure electric current
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Electric current can be measured by using a device called VOLTMETER.
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cos 2 theta = sin 30° × tan 60°
cos 2 theta = 1/ √2 × √ 3
cos 2 theta = √3/2
cos 2theta = cos 30° {cos 30° = √3/2}
2theta = 30°
theta = 30° /2
theta = 15. ........
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