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(a) Draw magnetic field lines around a c...

(a) Draw magnetic field lines around a current-carrying straight conductor.
(b) A compass needle is placed near a current-carrying straight conductor. State your observation for the following cases and give reasons for the same in each case :
(i) Magnitude of electric current is increased.
(ii) The compass needle is displaced away from the conductor.

Text Solution

Verified by Experts

(a) See

(b) (i) On increasing the electric current strength of magnetic field increases and hence deflection of compass needle increases.
(ii) If the compass needle is displaced away from the current-carrying conductor, the magnitude of deflection decreases on account of decrease in strength of magnetic field.
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Knowledge Check

  • The magnetic lines of force around a current carrying straight conductor are in the form of

    A
    coaxial cylinders
    B
    concentric circles
    C
    parallel lines
    D
    concentric spheres

  • The strength of the magnetic field around a current-carrying straight conductor

    A
    is same every where around the conductor.
    B
    is directly proportional to the square of distance of a point from the conductor.
    C
    is directly proportional to the current flowing in the conductor.
    D
    is inversely proportional to the current

  • A magnetic needle placed near a current carrying conductor deflects due to the

    A
    heating effect of electric current.
    B
    magnetic effect of electric current.
    C
    chemical effect of electrical current.
    D
    Both (b) and (c )

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