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e = -(ϕ₂ - ϕ₁)/t = -(0 - NBA)/t = NBA/t. t = NBA/e = 50 × 2 × 10⁻² × 10⁻² / 0.1 = 0.1 s.

1. t = 0.1 s
2. t = 0.2 s
3. t = 0.3 s
4. t = 0.4 s

Correct answer: t = 0.1 s

Solution

The calculation provided in the question is correct. Substituting the given values into the formula t = NBA/e yields t = 0.1 s, which matches option A.

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