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प्रश्न
A bar magnet of length 6 cm has a magnetic moment of 4JT-1 Find the strength of magnetic field at a distance of 200 cm from the centre of the magnet along its equatorial line.
पर्याय
4 × 10-8 tesla
3.5 × 10-8 tesla
5 × 10-8 tesla
3 × 10-8 tesla
MCQ
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उत्तर
5 × 10-8 tesla
Explanation:
Beq = `mu_0/(4pi)"M"/"d"^3`
= `10^-7xx4/3`
= 5 × 10-8 T
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