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Two point charges Q1 and Q2 exert a force F on each other when kept certain distance apart. If the charge on each particle is halved and the distance between the two particles is doubled, then the new force between the two particles would 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>Assignment>Q 12
Two equally charged identical small balls kept some fixed distance apart exert a repulsive force F on each other. A similar uncharged ball, after touching one of them is placed at the mid-point of line joining the two balls. Force experienced by the third ball is
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Gamma Question Bank for Medical Physics>Chapter 16 - Electric Charges and Fields>Assignment>Q 13
A charged gold leaf electroscope has its leaves apart by certain amount having enclosed air. When the electroscope is subjected to X-rays, then the leaves
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Gamma Question Bank for Medical Physics>Chapter 16 - Electric Charges and Fields>Assignment>Q 14
Two equal positive charges Q are fixed at points (a, 0) and (-a, 0) on the x-axis. An opposite charge -q at rest is released from point (0, a) on the y-axis. The charge -q will
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Gamma Question Bank for Medical Physics>Chapter 16 - Electric Charges and Fields>Assignment>Q 15
Four charges equal to -Q are placed at the four corners of a square and a charge q is at its centre. If the system is in equilibrium, the value of q is
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Gamma Question Bank for Medical Physics>Chapter 16 - Electric Charges and Fields>Assignment>Q 16

According to Coulomb's Law, which is correct relation for the following diagram ?

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Gamma Question Bank for Medical Physics>Chapter 16 - Electric Charges and Fields>Assignment>Q 17
A charge q is to be distributed on two conducting spheres. What should be the value of the charges on the spheres so that the repulsive force between them is maximum when they are placed at a fixed distance from each other in air ?
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Gamma Question Bank for Medical Physics>Chapter 16 - Electric Charges and Fields>Assignment>Q 18
A point charge q1 exerts an electric force on a second point charge q2. If third charge q3 is brought near, the electric force of q1 exerted on q2
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Gamma Question Bank for Medical Physics>Chapter 16 - Electric Charges and Fields>Assignment>Q 19
Three charges +4q, Q and q are placed in a straight line of length l at points at distances 0, l2 and l respectively. What should be Q in order to make the net force on q to be zero?