2. Questions Bank
  3. 12th Class
  4. Physics
  5. Magnetism

12th Class Physics Magnetism Question Bank MCQ - Moving Charges and Magnetism

  • question_answer
    A straight wire of diameter 1 mm carries a current of 1 A. It is replaced by another wire of diameter 2 mm, carrying same current. The strength of the magnetic field is:

    A) twice the former value

    B) one half of the former value

    C) same as the former value

    D) one quarter of the former value

    Correct Answer: C

    Solution :

    (c) same as the former value We know that, \[B=\frac{{{\mu }_{0}}l}{2\pi x}\] The field due to current carrying wire is independent of the diameter of the wire.


You need to login to perform this action.
You will be redirected in 3 sec spinner