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Electromagnetic Induction Test - 20

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Electromagnetic Induction Test - 20
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  • Question 1
    1 / -0
    Magnet is moved towards a coil first slowly and then quickly, then the induced emf is:
    Solution
     According to Faraday's Law when the magnetic flux linking a circuit changes, an electromotive force is induced in the circuit proportional to the rate of change of the flux linkage
    And the emf induced $$(E) = $$ $$-\dfrac{\mathrm{d\phi} }{\mathrm{d} t}$$
    Since the rate of changing of flux will be more in second case induced emf will also be more in second case.
    Therefore, D is correct option.
  • Question 2
    1 / -0
    Check the correct statement:
    Solution
     Faraday's First Law of Electromagnetic Induction states that whenever a conductor is placed in varying magnetic field emf are induced which is known as induced emf if the conductor circuit is closed current are also induced which are called induced current.
  • Question 3
    1 / -0
    An AC generator is a device which converts:
    Solution
    An AC generator converts mechanical energy into electrical energy, while a motor does the opposite - it converts electrical energy into mechanical energy. Both devices work because of electromagnetic induction, which is when a voltage is induced by a changing magnetic field.
  • Question 4
    1 / -0
    Which of the following uses the principle of electromagnetic induction?
    Solution

    The change in magnetic field lines associated with a coil is the cause of induced electric current in it. This is the principle of Electromagnetic induction. This change can be achieved by:
    • by moving the coil in a magnetic field or
    • by changing the magnetic field around the coil.

    Electric generator uses this principle in which a coil rotates in a magnetic field such that the current is induced in it due to the change in magnetic field lines linked with it.
  • Question 5
    1 / -0
    Which of the following defines electromagnetic induction:
    Solution
    The magnetic field associated with a coil is the magnetic flux flowing normally to the surface area of the current-carrying coil. When it changes, an emf is produced opposing the cause. This is the principle of Electromagnetic induction.
  • Question 6
    1 / -0
    Check the incorrect statement: When a magnet is moved into a coil the strength of the current depends on:
    Solution
    According to Faraday's Law when the magnetic flux linking a circuit changes, an electromotive force is induced in the circuit proportional to the rate of change of the flux linkage
    And the emf induced $$(E) = $$ $$-\dfrac{N\mathrm{d\phi} }{\mathrm{d} t}$$
    $$\Rightarrow current  = \dfrac{E}{R} $$ $$= $$ $$-\dfrac{N\mathrm{d\phi} }{R\mathrm{d} t}$$               $$eq...1$$
    So when a magnet is moved into a coil the strength of the current depends on
    A- The number of turns in the coil (N).So A is correct statement which can be seen from eq..1
    B- The speed with which the magnet moves  $$(\dfrac{\mathrm{d\phi} }{\mathrm{d} t})$$.So B is also correct statement which can be seen from eq..1
    C- The resistance of the coil (R).So C is also correct statement which can be seen from eq..1

    Therefore, D is correct option Since all are correct statements.
  • Question 7
    1 / -0
    In the magnet and coil experiment, the magnet and the coil are moved in the same direction with same speed, the emf induced in the coil is _________.
    Solution
    In the magnet and coil experiment, the magnet and the coil are moved in the same direction with same speed, the emf induced in the coil is zero because the relative speed of magnet with respect to coil is zero.
  • Question 8
    1 / -0
    Production of electricity from magnetism is called
    Solution
    The production of electricity from magnetism is electromagnetic induction. Electric current can produce magnetism and the reverse is also true.
  • Question 9
    1 / -0
    Which of following can induce the maximum induced voltage?
    Solution
    If we apply a high-frequency supply of the same peak voltage to the coil, the current still is being delayed by 90$$^o$$ but the time it requires to reach its maximum value has been reduced due to the increase in frequency. Because the frequency is inversely proportional to time (T). Hence, the rate of change of the flux within the coil has also increased due to the increase in frequency. Hence, the induced EMF is maximum in case of 1 amp 100 Hz supply source in the coil.
  • Question 10
    1 / -0
    Electromagnetic induction is the :
    Solution
    $$\bullet$$Electromagnetic induction is the production of current by relative motion between a magnet and a coil.
    $$\bullet$$The phenomenon of producing electric current in a conductor by moving it perpendicular to a magnetic field or vice -versa, is called electro magnetic induction.
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