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Physics Test - 2
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Physics Test - 2

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  • Question 1/10
    1 / -0

    In an electron gun, the electrons are accelerated by the potential V. If e is the charge and m is the mass of an electron, then the maximum velocity of these electrons will be

  • Question 2/10
    1 / -0

    A bar magnet dropped into a coil of a conducting wire, along its axis, will fall with an acceleration

  • Question 3/10
    1 / -0

    A generator at a utility company produces 100 A of current at 4000 V. The voltage is stepped up to 240000 V by a transformer before it is sent on a high voltage transmission line. The current in transmission line is

    Solutions

    Solution

    Given :     V1​=4000 volts      I1​=100 A              V2​=240000 volts

    Using      V1​I1​=V2​I2​

    ∴     4000×100=240000×I2​              ⟹I2​=1.67 A

  • Question 4/10
    1 / -0

    A 220 V, 1000 watt bulb is connected across a 110 V mains supply. The power consumed will be

  • Question 5/10
    1 / -0

    Consider the situation in the figure. The work done in taking a point charge from P to Ais WA, from P to B is WB and from P to C is WC.

    Solutions

    Solution

    WA = WB = WC

    Points A, B and C lie at the same distance from the charge q, i.e. they are lying on an equipotential surface. So, work done in moving a charge from A to B (WAB) or B toC (WBC) is zero.

    Hence, work done in bringing a charge from P to A  = WA,

    from P to B, WB = WA+WAB = WA

    and from P to C, WC = WA + WAB + WBC = WA​

    Hence, WA = WB = WC 

  • Question 6/10
    1 / -0

    A dust particle of mass 10-3 gm is stationary between the plates of a horizontal parallel plate capacitor of 0 .016m separation which is connected to a voltage of 100V. How many fundamental charges (e = 1.6 x 10-19 C) the dust particle carries

  • Question 7/10
    1 / -0

    A charge q is placed at the corner of a cube of side l. The electric flux passing through the cube is

    Solutions

    Solution

    Eight cubes, each side l, are required to form a Gaussian surface

    So that the charge q at the corner of a small cube appears at the centre of the bigger cube

    According to Gauss's law, the electric flux through the bigger cubes = q ∈ 0

    Hence the electric flux through the given small cube = q 8∈ 0

  • Question 8/10
    1 / -0

    A capacitor of capacity C1 is charged upto V volt and then connected to an unchanged capacitor of capacity C2. The potential difference across each capacitor will be

    Solutions

    Solution

    Charge on first capacitor = q1 = C11

    Charge on second capacitor = q2 = 0

    When they are connected, in parallel the total charge

    q = q1 + q2

    ∴ q = C11

    and capacitance, C = C1 + C2

    Let V' be the common potential difference across each capacitaor, then q = CV'

    ∴ V' = q C = C1V/ C1 + C2

  • Question 9/10
    1 / -0

    Dielectric constant of a medium is unity. Its permittivity will be:

  • Question 10/10
    1 / -0

    If a current is passed in a spring, it

    Solutions

    Solution

    Two conductors will attract each other if they have current flowing in same direction. in a spring each loop has current flowing in same direction resulting in contraction of the spring.

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