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28 December, 03:34

A generator is constructed by rotating a coil of N turns in a magnetic field B at a frequency f. The internal resistance of the coil is R and the cross sectional area of the coil is A.

The average induced EMF doubles if the area A isdoubled.

a. True

b. False

The average induced EMF doubles if the frequency f isdoubled.

a. True

b. False

The maximum induced EMF occurs when the coil is rotatedabout an axis perpendicular to area A.

a. True

b. False

The average induced EMF doubles if the resistance R isdoubled.

a. True

b. False

The average induced EMF doubles if the magnetic field Bis doubled.

a. True

b. False

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Answers (1)
  1. 28 December, 03:56
    0
    Find the explanations below

    a. True

    b. False

    a. True

    b. False

    a. True

    Explanation:

    The EMF is given by:

    E = NABwsinwt

    where

    E induced EMF

    A Area

    B magnetic field

    w Angular velocity

    wt phase angle

    where w = 2π/f

    E = 2πNABsinwt/f

    The average induced EMF doubles if the area A is doubled.

    E ∝ A

    a. True

    The average induced EMF doubles if the frequency f is doubled.

    E ∝ 1/f

    b. False

    The maximum induced EMF occurs when the coil is rotated about an axis perpendicular to area A.

    E ∝ sinwt

    ∅ = wt

    at 90 deg

    sinwt = sin90=1

    a. True

    The average induced EMF doubles if the resistance R is doubled.

    The induced voltage at zero current does not depend on the resistance of the conductor. As soon as a load is connected to it, the effective voltage measured on the conductor will be reduced by V=IR, though.

    b. False

    The average induced EMF doubles if the magnetic field B is doubled.

    E ∝ B

    a. True
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