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Which of the following is the right expression to define the magnetic field B?

• (a)$\vec{F} = q(\vec{v} \times \vec{B})$
• (b)$\vec{F} = B(\vec{I} \times \vec{l})$
• (c)$\frac{F}{l} = \frac{\mu_0}{2\pi} \frac{I^2}{a}$
• (d)$B = \mu_0 n i$

Answer

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From ISC 2022 Specimen Physics Paper 1, question 32.