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Electromagnetic...

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  • Question 1
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    When a current of 2 A is passed through a coil of 100 turns, flux associated with it is $$5\, \times\, 10^{-5}$$ Wb.
    Find the self inductance of the coil.

  • Question 2
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    Voltage in the secondary coil of a transformer does not depend upon :

  • Question 3
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    A straight conductor of length $$0.4 m$$ is moved with a speed of $$7 {m}/{s}$$ perpendicular to the magnetic field of intensity of $$0.9 {Wb}/{{m}^{2}}$$. The induced emf across the conductor will be :

  • Question 4
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    A fighter plane of length 20 m, wing span (distance from tip of one wing to the tip of the other wing) of 15 m and height 5 m is flying towards east over Delhi. Its speed is $$240 ms^{-1}$$. The earth's magnetic field over Delhi is $$5 \times 10^{-5}$$ T with the declination angle $$\sim 0^o$$ and dip of $$\theta$$ such that $$sin \theta = \frac{2}{3}$$. If the voltage developed is $$V_B$$ between the lower and upper side of the plane and $$V_{W}$$ between the tips of the wings then $$V_{B}$$ and $$V_{W}$$ are close to 

  • Question 5
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    The magnitude of the induced emf in a coil of inductance $$30\ mH$$ in which the current changes from $$6\ A$$ to $$2\ A$$ in $$2\ s$$ is:

  • Question 6
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    A metallic wire bent in form of a semi-circle of radius 0.1 m is moved in a direction parallel to its plane, but perpendicular to a magnetic field $$B = 20$$ mT with a velocity of 10  m/s. What is the induced e.m.f. in wire?

  • Question 7
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    A glass rod of length $$\ell$$ moves with a velocity $$v$$ in a uniform magnetic field $$B$$, what will be the emf induced in the rod:

  • Question 8
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    The magnetic flux linked with a coil at any instant $$t$$ is given by $$\displaystyle \phi =5{ t }^{ 3 }-100t+300$$, the emf induced in the coil at $$t=2\ s$$ is:

  • Question 9
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    A rectangular coil of $$300$$ turns has an average area of $$25\ cm \times  10\ cm$$. The coil rotates with a speed of $$50\ cps$$ in uniform magnetic field of strength $$4 \, \times \, 10^{-2} \, T$$ about an axis perpendicular to the field. The peak value of the induced emf is (in volt):

  • Question 10
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    Match the following:

    QuantityFormula
    1) Magnetic flux linked with a coila) $$\displaystyle -N\frac { d\phi  }{ dt } $$
    2) Induced emfb) $$\displaystyle { \mu  }_{ r }{ \mu  }_{ 0 }{ n }_{ 1 }{ n }_{ 2 }{ \pi r }_{ 1 }^{ 2 }l$$
    3) Force on a charged particle moving in a electric and magnetic fieldc) $$\displaystyle BA\cos { \theta  } $$
    4) Mutual inductance of a solenoidd) $$\displaystyle q\left( \overline { E } +\overline { v } \times \overline { B }  \right) $$

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