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MHT CET202019 Oct 2020Morning ShiftPhysicsMagnetic Effects of CurrentActual

A long metal rod of length 'L' completes the circuit as shown. The area of the circuit is perpendicular to magnetic field ' B^ . Total resistance of the circuit is ' R '. The force needed to move the rod in the direction as shown with constant speed ' V ' is

Options

  1. AB ² LV R
  2. BBLV R
  3. CBLV ² R
  4. DB ² ~L ² ~V R

Correct answer

D. B ² ~L ² ~V R

Step-by-step solution

(A) array l Power P = B ² ~L ² ~V ² R FV = B ² ~L ² ~V ² R F = B ² ~L ² ~V R array

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