JEE Mains · Physics · STD 12 -6. Electromagnetic induction
A circular loop of radius 7 cm is placed in uniform magnetic field of 0.2 T directed perpendicular to plane of loop. The loop is converted into a square loop in 0.5 s . The EMF induced in the loop is ___________ mV.
- A 6.6
- B 13.2
- C 8.25
- D 1.32
Answer & Solution
Correct Answer
(D) 1.32
Step-by-step Solution
Detailed explanation
induced EMF \(=\frac{ d \phi}{ dt }\) circumference \(\simeq 14 \pi\) side length of square loop \(=\frac{14 \pi}{4}=\frac{7 \pi}{2}\) \(\Delta \phi= B \left( A _1- A _2\right)\) \(=(.2)\left(\left(\frac{7 \pi}{2}\right) \times \frac{7 \pi}{2}-49 \pi\right) \times 10^{-4}\)…
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