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Physics-

General

Easy

Question

A coil self inductance L = 0.04 H and resistance R = 12 $blank capital omega$ , connected to 220 V, 50Hz supply, what will be the current flow in the coil?

11.7 A
12.7 A
10.7 A
14.7 A

The correct answer is: 12.7 A

Given, $L equals 0.04 blank H comma R equals 12 capital omega comma blank V equals 220 blank$ volt and $f equals 50 blank H z$
The value of current
$I equals fraction numerator V over denominator Z end fraction$
Or $I equals fraction numerator V over denominator square root of R to the power of 2 end exponent plus open parentheses omega L close parentheses to the power of 2 end exponent end root end fraction$
Or $I equals fraction numerator V over denominator square root of R to the power of 2 end exponent plus open parentheses 2 pi f L close parentheses to the power of 2 end exponent end root end fraction$
Or $I equals fraction numerator 220 over denominator square root of 144 plus open parentheses 2 pi cross times 50 cross times 0.04 close parentheses to the power of 2 end exponent end root end fraction$
Or $I equals 12.7 blank A$

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A helicopter rises vertically with a speed of 100 ms^-1. If helicopter has length 10 m and horizontal component of earth’s magnetic field is $5 cross times 10 to the power of negative 3 end exponent W b m to the power of negative 2 end exponent comma$ then the induced emf between the tip of nose and tail of helicopter is

Physics-General

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Physics-General

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