railway RRB JE (CBT I + CBT II) Mock Test 2024 Electromagnetic Theory Magnetostatics Magnetic Flux Density
The magnetic flux Φ(in Web) linked with a single turn coil at an instant of time t (in second) is given by Φ(t) = 2t2 – 20t + 40. The induced EMF in the coil at the instant t = 2 seconds is
1
22V
2
20V
3
12V
4
10V