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Most Important Selected Qs for JEE AdvancedPhysicsMagnetic Effects of Current

Paragraph: Analog voltmeters and ammeters work by measuring the torque exerted by a magnetic field on a current carrying coil. The reading is displayed by means of the deflection of a pointer over a scale. The adjacent figure shows the essentials of a galvanometer, on which both analog ammeters and analog voltmeters are based. Assume that the coil is 2.1 cm high, 1.2 cm wide, has 250 turns and is mounted so that it c

Options

  1. A28^
  2. B=28^
  3. C14^
  4. Dnone of these

Correct answer

B. =28^

Step-by-step solution

I = ni A B^ K ^ , B ^ =3 ~B , ~K ^ =3 ~K =28^

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