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A long solenoid of radius R carries a time (t) dependent current I(t) = I0t(1 − t). A ring of radius 2R is placed coaxially near its middle. During the time instant 0 ≤ t ≤ 1, the induced current (IR) and the induced EMF (VR) in the ring changes as:

  1. a. Direction of IR remains unchanged and VR is maximum at t = 0.5
  2. b. Direction of IR remains unchanged and VR is zero at t = 0.25
  3. c. At t = 0.5 direction of IR reverses and VR is zero
  4. d. At t = 0.25 direction of IR reverses and VR is maximum
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