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(a) A metallic rod of length l is moved ...

(a) A metallic rod of length l is moved perpendicular to its length with velocity v in a magnetic field `vec(B)` acting perpendicular to the plane in which rod moves. Derive the expression for the inducced emf.
(b) A wheel with 15 metallic spokes each 60 cm long, is rotated at 360 rev/min in a plane normal to the horizontal component of earth's magnetic field. The angle of dip at that place is `60^(@)`. If the emf induced between rim of the wheel and the axle is 400 mV, calculate the horizontal component of earth's magnetic field at the place.
How will the induced emf change, if the number of spokes is increased ?

Answer

Step by step text solution for (a) A metallic rod of length l is moved perpendicular to its length with velocity v in a magnetic field vec(B) acting perpendicular to the plane in which rod moves. Derive the expression for the inducced emf. (b) A wheel with 15 metallic spokes each 60 cm long, is rotated at 360 rev/min in a plane normal to the horizontal component of earth's magnetic field. The angle of dip at that place is 60^(@). If the emf induced between rim of the wheel and the axle is 400 mV, calculate the horizontal component of earth's magnetic field at the place. How will the induced emf change, if the number of spokes is increased ? by PHYSICS experts to help you in doubts & scoring excellent marks in Class 12 exams.

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A wheel with 15 metallic spokes, each 60 cm long, is rotated at 360 revolutions per minute in a plane normal to the horizontal component of earth's magnetic field. The angle of dip at that place is 60^(@) . If the emf induced between rim of the wheel and the axle 400 mV, calculate the horizontal component of earth's magnetic field at the place. How will the induced emf change if the number of spokes is increased ?

A wheel with 15 metallic spokes each 60 cm long is roated at 360 rpm in a plane normal to the horizontal component of earth's magnetic field. The angle of dip at that place 60^(@) . If the e.m.f. induced between the rim of the wheel and the axle is 400 m mV, calculate horizontal component of earth's magnetic field at the place. How will the induced e.m.f. change. if number of spokes is increased ?

Knowledge Check

  • A wheel with 20 metallic spokes each of length 8.0 m long is rotated with a speed of 120 revolution per minute in a plane normal to the horizontal component of earth magnetic field H at a place. If H=0.4xx10^(-4) T at the place, then induced emf between the axle the rim of the wheel is

    A
    `2.3xx10^(-4)V`
    B
    `3.1xx10^(-4)V`
    C
    `2.9xx10^(-4)V`
    D
    `1.61xx10^(-4)V`

  • A wheel with 10 metallic spokes, each 0.5 m long, is rotated with an angular speed of 120 rpm in a plane normal to the earth's magnetic field at the place. If the magnitude of the field is 0.4G, the magnitude of induced emf between the axle and the rim of the wheel is equal to

    A
    ` 1.256 xx 10^(-3)V`
    B
    `6.28 xx 10^(-4) V`
    C
    `1.256 xx 10^(-4) V`
    D
    `6.28 xx 10^(-5)V`

  • A metal rod of length I is moved with velocity v in a uniform magnetic field vec B . Emf is induced between the two ends of rod

    A
    when `vec l` is parallel to `vec B`
    B
    when `vec l` is parallel to `vec v`
    C
    when `vec v` is parallel to `vec B`
    D
    none of the above cases

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