If the magnetic flux through a coil of 1200 turns increases from zero to $5.4 \times 10^{-5}$ Wb in 2.7 ms, what is the magnitude of the induced emf during this time
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → 24 V
Induced emf, $ε=-N\frac{d\phi_B}{dt}$ [Faraday's law]
where,
N = number of turns in coil = 1000 turns [given]
$\frac{d\phi_B}{dt}$ = Change in Magnetic flux with time
$ε=1000×\frac{5.4×10^{-5}}{2.7×10^{-3}}$
$=24V$