Home›MPPSC Forest›State Forest Service Mains Exam›Section 'B': Forestry and General Science›UNIT-07: Physics›Magnetic effect of current: Oersted experiment, electromagnetic induction, electric motor, generator (working principle and use), general studies of alternating current and direct current›The value of the magnetic field at a distance x from a long, straight

The value of the magnetic field at a distance x from a long, straight current carrying conductor is proportional to

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A.x
B.x2x^2x2
C.1/x21/x^21/x2
D.1/xCorrect
Explanation & Solution

Correct Answer: (D) 1/x

According to the Biot-Savart Law, the magnetic field 'B' produced by a long straight conductor carrying current 'I' at a distance 'x' is given by B = (μ₀I)/(2πx). Therefore, the magnitude of the magnetic field is inversely proportional to distance x (B ∝ 1/x).

हिंदी में प्रश्न एवं आदर्श उत्तर

एक लम्बे, सीधे धारावाही चालक से x दूरी पर चुम्बकीय क्षेत्र का मान अनुक्रमानुपाती होगा

A.x
B.x2x^2x2
C.1/x21/x^21/x2
D.1/xसही

सही उत्तर: (D) 1/x

बायो-सेवर्ट नियम के अनुसार, 'I' धारा कावहन करने वाले लंबे सीधे चालक से 'x' दूरी पर उत्पन्न चुम्बकीय क्षेत्र 'B' का मान B = (μ₀I)/(2πx) होता है। अतः चुम्बकीय क्षेत्र का मान दूरी x के व्युत्क्रमानुपाती (B ∝ 1/x) होता है।

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