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Magnetic Effects of Electric Current Test - 8

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Magnetic Effects of Electric Current Test - 8
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  • Question 1
    1 / -0

    What will happen when a magnet is taken towards a circular coil?

    Solution

    According to Lenz's law, when a closed coil is linked with a varying magnetic flux, then some current is induced in the coil.
    So, when a magnet is taken towards a circular coil, then a varying magnetic flux is linked with the coil so that current is induced in the coil. This phenomenon is said to be electromagnetic induction.

  • Question 2
    1 / -0

    Who said that current can cause magnetic field?

    Solution

    Hans Christian Oersted was a Danish Physicist who discovered that electric current can create magnetic fields which was the first connection between electricity and magnetism.

  • Question 3
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    An electron beam is moving vertically upwards if it passes through a magnetic field which is directed from south to north in a horizontal plane then in which direction will the beam be deflected?

    Solution

    The encircled cross represents the direction of v electron. applying the right hand rule for the cross product of vectors,we find that the direction of vector( V*B)  is towards east since Fm = -e(V*B), therefore the force is directed towards west.

  • Question 4
    1 / -0

    The fuse wire should have

    Solution

    A fuse wire has high resistance and low melting point so that it will melt if a current of large magnitude passes through the wire.

  • Question 5
    1 / -0

    Transformer works on the principle of

    Solution

    Transformer works on the principle of mutual induction of two coils or Faraday Law’s Of Electromagnetic induction. When current in the primary coil is changed the flux linked to the secondary coil also changes. Consequently an EMF is induced in the secondary coil due to Faraday law’s of electromagnetic induction.

  • Question 6
    1 / -0

    What are the constituents of Alnico?

    Solution

    Alnico is the name for an iron alloy that primarily consists of iron, aluminum (Al), nickel (Ni) and cobalt (Co). That is why it is called al-ni-co. It can also be spelled AlNiCo. Sometimes, it may also contain copper and titanium. Alnico alloys are used as permanent magnets, as they are ferromagnetic.

  • Question 7
    1 / -0

    Who first detected the presence of magnetic field in earth?

    Solution

    Magnetic field lines were introduced by Michael Faraday (1791-1867) who named them "lines of force." 

  • Question 8
    1 / -0

    An electric fuse can prevent accidents arising from-

    Solution

    An electric fuse can disconnect power supply from the circuit by causing a  break in  the circuit , thereby preventing the circuit from overload or short circuit . Thus heavy current is not allowed to flow through the circuit and the circuit and electric appliances are protected.

  • Question 9
    1 / -0

    Which of the following describes the common domestic power supplied in India?

    Solution

    The voltage in India is 220 volts, alternating at 50 cycles (Hertz) per second. The advantage of 220 is lower current and thus less power loss. And the ability to use thinner wires - less copper.

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