An alternating current of frequency f is flowing through an idea
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    Subject
    Physics

    Class

    ICSE Class 12

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    ISC Class 12 Physics Solved Question Paper 2008

    Multiple Choice QuestionsShort Answer Type

    1.

    Write Coulomb’s Law in vector form.

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    2. How much kinetic energy is gained by an electron, initially at rest, when it moves through a potential difference of 1000 V ? Leave your answer in Joule.
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    3. A wire of resistivity y is stretched uniformly so that its length becomes four times. What is its new resistivity ? (Assume temperature of the wire remains constant during stretching of the wire.)
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    4. Show graphically how electrical resistance of a piece of Silicon or Germanium varies when its temperature is varied.
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    5.  A circular coil having 50 turns, each with an area of 0.01 m2, carries a current of 2A. Calculate its magnetic dipole moment.
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    6. How are the electric vector E , the magnetic vector B  and velocity vector c oriented in an electromagnetic wave?
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    7. State two conditions which must be satisfied in order to apply Tangent Law in magnetism? 
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    8. A straight conductor of length 0.4 m is moved with a speed of 7 ms-1 along the direction of a uniform magnetic field. What will be the emf induced, if any, across its ends ?
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    9. An alternating current of frequency f is flowing through an ideal choke coil of self inductance L. If V° and I ° be the peak values of the voltage and current, find the average power consumed, if any, by the choke coil.

    For a clock coil R > > WL,

    Power factor, cos straight ϕ space equals space straight R over ωL space equals space 0
    Average power, Veff . Ieff . cos straight ϕ
    Average power = 0

    Therefore, 

    Pav = 0
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    10. What type of wavefront is generated from a line source of light ?
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    NCERT Solutions
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