Question

how to measure electric current​

Answer 1

Electric current can be measured by using a device called VOLTMETER.

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Answer 2

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. ........