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Three small , identical point charges li...

Three small , identical point charges lie on the circumference of a circle forming an equilateral triangle.Calculate the value of electric field at the centre of circle.

Text Solution

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The correct Answer is:
Zero
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Knowledge Check

  • Assertion: Three equal charges are situated on a circle of radius r such that they form on equilateral triangle, then the electric field intensity at the centre is zero. Reason: The force on unit positive charge at the centre, due to the three equal charges are represented by three sides of a triangle taken in the same order. Therefore, electric field intensity at centre is zero.

    A
    if both Assertion and Reason are true and the Reason is correct explanation of the Assertion.
    B
    If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
    C
    if Assertion is true, but the Reason is false.
    D
    if both Assertion and Reason are false

  • At each corner of an equilateral triangle identical charges are placed. Then at the centre of the triangle

    A
    the resultant electric intensity is zero
    B
    the net potential is zero
    C
    both electric intensity and potential are zero
    D
    neither electric intensity nor potential are zero

  • The circumference of a circle is equal to the perimeter of an equilateral triangle. If the radius of the circle is 7 cm what is the length of the equilateral triangle ?

    A
    `(22)/(3)cm`
    B
    `(44)/(3)cm`
    C
    44 cm
    D
    22 cm

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