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Magnetic flux linked with the loop is ϕ = Bπr².

1. ϕ = Bπr²
2. ϕ = Bπr
3. ϕ = Bπr³
4. ϕ = Bπr⁴

Correct answer: ϕ = Bπr²

Solution

Magnetic flux (ϕ) is given by the product of the magnetic field (B) and the area (A) through which it passes. For a circular loop, the area is πr². Thus, ϕ = Bπr².

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