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    Electric Charges and Fields (Javed Sir)

    Uploaded by

    Akshit Minz
    The document contains 15 multiple choice questions and 5 fill in the blank questions about electric charge, electric fields, and related concepts in physics. The questions cover topics such as the relative strength of electrostatic forces between protons and electrons, electric flux through closed surfaces, methods of producing static electricity, relationships between electric field strength and distance or charge, and definitions of units like the Coulomb.

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    Download as PDF, TXT or read online from Scribd

    Electric Charges and Fields (Javed Sir)

    Uploaded by

    Akshit Minz
    30 views4 pages
    The document contains 15 multiple choice questions and 5 fill in the blank questions about electric charge, electric fields, and related concepts in physics. The questions cover topics such as the relative strength of electrostatic forces between protons and electrons, electric flux through closed surfaces, methods of producing static electricity, relationships between electric field strength and distance or charge, and definitions of units like the Coulomb.

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    The document contains 15 multiple choice questions and 5 fill in the blank questions about electric charge, electric fields, and related concepts in physics. The questions cover topics such as the relative strength of electrostatic forces between protons and electrons, electric flux through closed surfaces, methods of producing static electricity, relationships between electric field strength and distance or charge, and definitions of units like the Coulomb.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    30 views4 pages

    Electric Charges and Fields (Javed Sir)

    Uploaded by

    Akshit Minz
    The document contains 15 multiple choice questions and 5 fill in the blank questions about electric charge, electric fields, and related concepts in physics. The questions cover topics such as the relative strength of electrostatic forces between protons and electrons, electric flux through closed surfaces, methods of producing static electricity, relationships between electric field strength and distance or charge, and definitions of units like the Coulomb.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 4

    Question 1.

    In comparison With the electrostatic force between two electrons, the


    electrostatic force between two protons is:
    (a) greater
    (b) smaller
    (c) zero
    (d) same

    Question 2.
    If electric flux through a closed surface is zero. It means that:
    (a) the net charge inside the surface is zero.
    (b) the electric field is necessarily zero at all points on the surface.
    (c) no charge exists inside the surface.
    (d) no charge exists outside the surface.

    Question 3.
    Static electricity is produced by
    (a) induction only
    (b) friction
    (c) chemical reaction only
    (d) friction and induction both.

    Question 4.
    When distance between two charges is reduced to one-half of the original
    distance, the force between them will remain the same if one of the
    charges is made:
    (a) one fourth
    (b) four times
    (c) double
    (d) one-halftimes.

    Question 5.
    A unit Coulomb charge is one which when placed in air at a distance of 1 m
    from an equal and similar charge repel it with a force of
    (a) 9 × 109 N
    (b) 1 N
    (c) 1 dyne
    (d) None of these.
    Question 6.
    When two charged spheres are connected with a wire, the electric charge
    on them is shared:
    (a) inversely as their capacity
    (b) equally
    (c) in proportional to their capacity
    (d) None of these.

    Question 7.
    An electric dipole of moment p is placed in the position of stable equilibrium
    in a uniform electric field E⃗ . The couple required to rotate it through an
    angle 6 the initial position is:
    (a) -PE cos θ
    (b) PE tan θ
    (c) PE cos θ
    (d) PE sin θ.

    Question 8.
    Two point charges each of 20 µC are placed 50 cm apart in air. What is the
    electric field intensity at the mid point on the line joining the centre of two
    point charges?
    (a) 5 × 106 NC-1
    (b) 18 × 106 NC-1
    (c) Zero
    (d) None of these

    Question 9.
    Two charges 10 pC and 5 pC are placed 20 cm apart. The ratio of
    Coulomb’s force experienced by there is:
    (a) 2 : 5
    (b) 1 : 1
    (c) √3 = √7
    (d) None of these

    Question 10.
    The figure here shows electric field lines. The electric field strength at P 1 is
    E1 and that at P2 is E2 If distance between P1, P2 is r, then which of the
    following statement is true?

    (a) E1 > E2
    (b) E1 < E2
    (c) E2 = rE1
    (d) E2 = E1/r²
    Question 11.
    The surface charge density oil the copper sphere is σ. The electric field
    strength on the surface of Sphere of radius r is:
    (a) σ2
    (b) σ
    (c) σ2ε0
    (d) σ/ε0

    Question 12.
    A sphere ‘P’ of mass 6.4 × 10-15 kg is hanging between the two charged
    parallel plates as shown in figure. How many electrons can be added or
    removed from the sphere so that it still remains hanging?

    (a) 8 electrons can be added


    (b) 8 electrons can be removed
    (c) No. electron can be added or removed
    (d) 8 electrons can be either removed or added.

    Question 13.
    Which of the following method is an indirect method of charging:
    (a) charging by induction
    (b) charging by physical contact
    (c) charging by friction
    (d) none of these.

    Question 14.
    An electron and a proton are placed in the same uniform electric field. What
    will be the ratio of the acceleration of electron to that of proton?
    (a) 1
    (b) zero
    (c) mpme
    (d) memp
    Question 15.
    The position of the charge inside the enclosing surface is changed in such
    a way that the total charge remains constant. Then the total normal electric
    flux through the enclosing surface:
    (a) increases
    (b) decreases
    (c) changes erratically
    (d) Remains unchanged.

    Fill in the Blanks


    Question 1.
    The force between two point charges ………………… when dielectric
    constant of the medium in which they are held increases.

    Question 2.
    When a dielectric medium is placed in a uniform electric field, the dielectric
    constant of the medium is the ratio of the ……………….. of the medium to
    the ……………… of free space.

    Question 3.
    Two identical charges are placed at a distance 2a apart as shown in figure.
    The potential energy of the positively charged particle placed at the mid
    point O will be …………….

    Question 4.
    The number of electric lines of force that radiate outward from 1C charge is
    ………………

    Question 5.
    ……………… is a central force in nature.

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