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d B = \frac{μ_{\circ}}{4 π} \frac{I d I \times r}{r^{3}}

d B = \frac{μ_{\circ}}{4 π} \frac{I d I \sin θ}{r^{3}}

d B = \frac{μ_{\circ}}{4 π} \frac{I d I \times r}{r^{2}}

d B = \frac{μ_{\circ}}{4 π} \frac{I d I}{r^{2}}

ANS : 1

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