In a region at a distance r from z-axis magnetic field B=B0rtk is present B0 is constant t is time. Then the magnitude of induced electric field at a distance r from z-axis is given by
−r2B0
−r22B0
−r23B0
none of these
A
−r2B0
B
−r22B0
C
none of these
D
−r23B0
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