AP EAMCET202315 May 2023Morning ShiftPhysicsElectromagnetic InductionActual
In an ac generator, if coil of N turns and area A is rotated at u revolutions per second in a uniform magnetic field B , then the motional emf produced is equal to (At t =0 ~s , the coil is perpendicular to the field)
Options
- ANBA (2 u) (2 u t)
- BNBA ^2(2 v) (2 v t)
- CN ^2 ~B ^2 ~A ^2(2 v) (2 v t)
- DNBA (4 v) (2 v t)
Correct answer
A. NBA (2 u) (2 u t)
Step-by-step solution
Flux, = B ( NA ) t and =2 v emf , e =- d dt = - d dt BNA t =- NBA ( t )| e |= NBA (2 v ) (2 vt )