A solenoid of radius 2.7 cm has380 turns and a len...

Answers ( 2 )

  1. mathilde petersen
    mathilde petersen
    Given radius(R) = 2.7*10-2m
               Numberof turns(N) = 380
              Length(l) = 0.22m
    Now the formula for the inductance is
           ........................(1)
    Where ?0 = 4?*10-7
    Substitute all the given values in the eq(1) we get the valueof the self inductance(L).
    Now we know the formula for the induced emf is
              
                
                  
    Where ? = 70mV
                 = 70*10-3V
              dI/dt =?
              L issubstituted here which is obtained above.
  2. batur tekelio?lu
    batur tekelio?lu
    (a)
       r = 2.7 cm
          = 0.027 m
       A = ? r2
       N = 380
       l = 22 cm
         = 0.22 m
       the inductance will be
       L = ?o N2 A / l
    (b)
       ? = 70 mV
          = 70 x 10-3 V
       ? = L (?I / ?t)
       the rate at which current must change willbe
       ?I / ?t = ? / L
                 = ............. amps / s
           

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