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Physics Test 173

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Physics Test 173
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Weekly Quiz Competition
  • Question 1
    4 / -1

    A square surface of side L meter in the plane of the paper is placed in a uniform electric field E (volt/m) acting along the same plane at an angle θ with the horizontal side of the square as shown in Figure. The electric flux linked to the surface, in units of volt. m, is

    Solution

     

  • Question 2
    4 / -1

    A non-conducting disc of radius ‘a’ and uniform surface charge density s is placed on the ground, with its axis vertical. A particle of mass m and positive charge Qis dropped, along the axis of the disc, from a height H with zero initial velocity. The particle has q/m Electrostatic potential at H is

  • Question 3
    4 / -1

    The total current supplied to the circuit by the battery is

    Solution

     

  • Question 4
    4 / -1

    A thin flexible wire of length L is connected to two adjacent fixed points and carries a current I in the clockwise direction, as shown in the figure. When the system is put in a uniform magnetic field of strength B going into the plane of the paper, the wire takes the shape of a circle. The tension in the wire is

    Solution


     

  • Question 5
    4 / -1

    A dip circle is so set that its needle moves freely in the magnetic meridian. In this position, the angle of dip is 40. Now the dip circle is rotated so that the plane in which the needle moves makes an angle of 30 with the magnetic meridian. In this position, the needle will dip by an angle

    Solution

     

  • Question 6
    4 / -1

    A uniform magnetic field of induction B is confined to a cylindrical region of radius R. The magnetic field is increasing at a constant rate of  tesla/second). An electron of charge e, placed at the point P on the periphery of the field experiences an acceleration.

    Solution


    As the field is increasing being directed inside the paper, hence there will be anticlockwise induced current (in order to oppose the cause) in the ring (assumed). Hence there will be a force towards left on the electrons.

     

  • Question 7
    4 / -1

    The current in a LR circuit builds up to 3/4th of its steady state value in 4s. The time constant of this circuit is

    Solution

     

  • Question 8
    4 / -1

    A point source of electromagnetic radiation has an average power output of 1500 W. The maximum value of electric field at a distance of 3m from this sources in Vm-1 is

  • Question 9
    4 / -1

    A container is filled with water  upto a height of 33.25 cm. A concave mirror is placed 15 cm above the water level and the image of an object placed at the bottom is formed 25 cm below the water level. Focal length of the mirror is

    Solution

     

  • Question 10
    4 / -1

    The adjacent figure shows Fraunhoffer’s diffraction due to a single slit. If first minimum is obtained in the direction shown, then the path difference between rays 1 and 3 is

    Solution

     

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