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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
  1. r2B0
  2. r22B0
  3. r23B0
  4. none of these

A
r2B0
B
r22B0
C
none of these
D
r23B0
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