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What is a radial magnetic field? How has...

What is a radial magnetic field? How has it been achieved in moving coil galvanometer?

Text Solution

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(i) The pole pieces of the permanet magnet are made cylindrically concave, concentric with the axis of the coil.
(ii) A soft iron cylinder is centred between the pole pieces so that is forms a narrow cylinderical gap in which the side of the coil can move.
Together, they produce a radial magnetic field, that is, the magnetic lines of force in the gap are along radii to the central axis.
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Obtain the expression for the deflecting torque acting on the current carrying rectangular coil of a galvanometer in a uniform magnetic field. Why is a radial magnetic field employed in the moving coil galvanometer?

Knowledge Check

  • The deflection in moving coil galvanometer is

    A
    directly proportional to the torsional constant
    B
    inversely proportional to the area of the coil
    C
    inversely proportional to the current
    D
    directly proportional to the number of turns in the coil

  • The deflection in moving coil galvanometer is

    A
    Directly proportional to the torsional constant
    B
    Directily proportional to the number of torsional coil
    C
    Inversty proportional to the area of coil
    D
    Inversely proportional to the current flowing

  • To make the field radial in moving coil galvanometer

    A
    the number of turns in the coil is increased
    B
    poles are cylindrically cut
    C
    magnet is taken in the form of horse shoe
    D
    coil is wound an aluminium frame

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    a) Obtain the expression for the deflecting torque acting on the current carrying rectangular coil of a Galvanometer in a uniform magnetic field. Why is a radial magnetic field employed in the moving coil galvanometer? b) Particles of mass 1.6 xx 10^(-27) kg and charge 1.6 xx 10^(-19) C are accelerated in a cyclotron of dee radius 40 cm. It employs a magnetic field of 0.4 T. Find the kinetic energy (in MeV) of the particle beam imparted by the accelerator.

    The deflection in a moving coil galvanometer is

    What is the function of a uniform radial magnetic field in the moving coil galvanometer?

    What is the function of the radial magnetic field in the moving coil galvanometer?

    State the principle of moving coil galvanometer.

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