JEE MAIN - Physics (2022 - 27th July Morning Shift - No. 17)
In a meter bridge experiment, for measuring unknown resistance 'S', the null point is obtained at a distance $$30 \mathrm{~cm}$$ from the left side as shown at point D. If R is $$5.6$$ $$\mathrm{k} \Omega$$, then the value of unknown resistance 'S' will be __________ $$\Omega$$.
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คำตอบ
2400
คำอธิบาย
$${R \over S} = {{70} \over {30}}$$
$$S = {3 \over 7} \times 5.6 \times {10^3} = 2.4 \times {10^3}\,\Omega $$
$$ = 2400\,\Omega $$