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Three equal charges +Q each are at the corners of an equilateral triangle as shown. The intensity of electric field at O will be

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Important Questions on Electric Charges and Fields

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Gamma Question Bank for Medical Physics>Chapter 16 - Electric Charges and Fields>EXERCISE>Q 13
Two very small spheres A and B are charged with +10 and +20 coulomb respectively and separated by a distance of 80 cm. The electric field at point on the line joining the centres of the two spheres will be zero at almost how much distance from A ?
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Gamma Question Bank for Medical Physics>Chapter 16 - Electric Charges and Fields>EXERCISE>Q 14
An electric dipole having charges +q and -q are at a separation r. At distance d>>r along the axis of the dipole, the field is proportional to
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Gamma Question Bank for Medical Physics>Chapter 16 - Electric Charges and Fields>EXERCISE>Q 15
Electric field lines about a negative point charge are
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Gamma Question Bank for Medical Physics>Chapter 16 - Electric Charges and Fields>EXERCISE>Q 16
An electric dipole placed in a uniform electric field experiences, in general
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Gamma Question Bank for Medical Physics>Chapter 16 - Electric Charges and Fields>EXERCISE>Q 17
An electric dipole consists of two opposite charges each of magnitude 2μC separated by a distance 1 cm. The dipole is placed in an external field of 103 N C-1. The maximum torque on the dipole is
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Gamma Question Bank for Medical Physics>Chapter 16 - Electric Charges and Fields>EXERCISE>Q 18
A point B lies on the perpendicular bisector of an electric dipole of dipole moment p→. The distance of $B$ from the dipole is r (r is much larger than the size of the dipole). The electric intensity at B is proportional to
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Gamma Question Bank for Medical Physics>Chapter 16 - Electric Charges and Fields>EXERCISE>Q 19
Which of the following statements is incorrect regarding the electric lines of forces?
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Gamma Question Bank for Medical Physics>Chapter 16 - Electric Charges and Fields>EXERCISE>Q 20
The electric field due to a point charge at a distance 6 m from it is 630 N C-1. The magnitude of the charge is