Physics-
General
Easy

Question

A square wire loop of 10.0 cm side lies at right angles to a uniform magnetic field of 20T. A 10 V light bulb is in a series with the loop as shown in the fig. The magnetic field is decreasing steadily to zero over a time interval capital deltat. The bulb will shine with full brightness if capital deltat is equal to

  1. 20 ms    
  2. 0.02 ms    
  3. 2 ms    
  4. 0.2 ms    

The correct answer is: 20 ms

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