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## Main Question or Discussion Point

Hi.

The induced emf is given by -d/dt ∫

Why isn't

For some reason the integral sign is appearing as a small circle in the above equations

The induced emf is given by -d/dt ∫

**B.dS**but when the time derivative is taken inside the integral sign this becomes -∫ ∂**B /∂t.dS**.Why isn't

**B.dS**differentiated using the product rule giving an extra term inside the integral sign ?For some reason the integral sign is appearing as a small circle in the above equations