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Moving Charges ...

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  • Question 1
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    H+, He+ and O++ ions having same kinetic energy pass through a region of space filled with uniform magnetic field B directed perpendicular to the velocity of ions. The masses of the ions H+, He+ and O++ are respectively in the ratio 1 : 4 : 16. As a result

  • Question 2
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  • Question 3
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  • Question 4
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    The radius of curvature of the path of a charged particle moving in static uniform magnetic field is

  • Question 5
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    Two coaxial solenoids 1 and 2 of the same length are set so that one is inside the other. The number of turns per unit length are n1 and n2. The currents i1 and i2 are flowing in opposite directions. The magnetic field inside the inner coil is zero. This is possible when

  • Question 6
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    The current sensitivity of a moving coil galvanometer can be increased by

  • Question 7
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    An electron and a proton are moving on straight parallel paths with same velocity. They enter a semi-infinite region of uniform magnetic field perpendicular to the velocity. Which of the following statement(s) is/are true

  • Question 8
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  • Question 9
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    Statement-I The sensitivity of a moving coil galvanometer is increased by placing a suitable magnetic material as a core inside the coil.
    Statement-II Soft iron has a high magnetic permeability and cannot be easily magnetized or demagnetized.

  • Question 10
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    Advanced countries are making use of powerful electromagnets to move trains at very high speed. These trains are called maglev trains (abbreviated form magnetic levitation). These trains float on a guideway and do not run on steel tail tracks.
    Instead of using an engine based on fossil fuels, they make use of magnetic field forces. The magnetized coils are arranged in the guideway which repel the strong magnets placed in the train\'s under carriage. This helps train move over the guideway, a technique called electrodynamic suspension. When current passes in the coils of guideway, a typical magnetic field is set up between the undercarriage of train and guideway which pushes and pulls the train along the guideway depending on the requirement.
    The lack of friction and its aerodynamic style allows the train to move at very high speed
    The force which makes maglev move is

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