induced electric field = 0
=> dφ/dt = 0
=> φ= consnt (i.e. independent of time)
Now φ is given as φ = (3kt*πr12 - kt*π(r22-r12))
= ktπ*(4r12 - r22)
φ is constant if coeff of t = 0
i.e. 4r12 - r22 = 0
=> r1/r2 = 0.5
Consider cylindrical region of the magnetic field shown in figure. region 1 and region 2 have magnetic field directed perpendicularly outward and inward respectively . fields are varying with time as
region1 :B=3kt
region 2:B=kt
then r1/r2 such that there is no induced electric field in the region out side magnetic field?
answer with explanation
your answer is wrong asish......the answer is 0.5 .again when induced emf is 0 it is not necessary that flux is 0.it should be constant.recheak it
induced electric field = 0
=> dφ/dt = 0
=> φ= consnt (i.e. independent of time)
Now φ is given as φ = (3kt*πr12 - kt*π(r22-r12))
= ktπ*(4r12 - r22)
φ is constant if coeff of t = 0
i.e. 4r12 - r22 = 0
=> r1/r2 = 0.5