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Most Important Selected Qs for JEE AdvancedPhysicsCurrent Electricity

Figure shows a copper wire of nonuniform cross section carrying current toward right for sectors A , B and C .

Options

  1. Ai _ B i _ A i _ C ( i = current )
  2. BE _ B E _ A E _ C ( E = electric field )
  3. CV _ B V _ A V _ C ( V = drift velocity )
  4. DJ _ B J _ A J _ C ( J = current density )

Correct answer

D. J _ B J _ A J _ C ( J = current density )

Step-by-step solution

aligned & i will same & i = neA Vd & ~J = i A , j ^2 E aligned Current through the wire is same i_A=i_B=i_C i = neAV _ d and J= i A

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