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Two equal and opposite charges are placed at a certain distance. The force between them is F. If 25% of one charge is transferred to other, then the force between them is -

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Important Questions on Electric Charges and Fields

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CUET (UG)
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Achieve CUET (UG) Physics Practice Book>Chapter 1 - Electric Charges and Fields>Exercise>Q 44
Two point charges +3 μC and +8 μC repel each other with a force of 40 N. If a charge of  –5 μC is added to each of them, then the force between them will become -
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Achieve CUET (UG) Physics Practice Book>Chapter 1 - Electric Charges and Fields>Exercise>Q 45

If two like charges of magnitude 1×10-9 coulomb and 9×10-9 coulomb are separated by a distance of 1 m, then the point on the line joining the charges, where the force experienced by a charge placed at that point is zero, is:

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Achieve CUET (UG) Physics Practice Book>Chapter 1 - Electric Charges and Fields>Exercise>Q 46
The force of interaction between two charges q1=6μC⁡ and q2=2μC⁡ is 12 N. If charge q=-2μC⁡ is added to each of the charges, then the new force of interaction is
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Achieve CUET (UG) Physics Practice Book>Chapter 1 - Electric Charges and Fields>Exercise>Q 47
Two balls, with equal charges, are placed in a vessel with ice, at –10 °C, at a distance of 25 cm from each other. On forming water at 0 °C, the balls are brought nearer to 5 cm, for the interaction between them to be same. If the dielectric constant of water, at 0 °C, is 80, the dielectric constant of ice, at –10 °C, is
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Achieve CUET (UG) Physics Practice Book>Chapter 1 - Electric Charges and Fields>Exercise>Q 48
At a point in space, the electric field points towards North. In the region surrounding this point, the rate of change of potential will be zero along 
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Achieve CUET (UG) Physics Practice Book>Chapter 1 - Electric Charges and Fields>Exercise>Q 49
The position of the point where net electric field will be zero is:

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Achieve CUET (UG) Physics Practice Book>Chapter 1 - Electric Charges and Fields>Exercise>Q 50
A small sphere of mass 2 g having charge 5 μC is suspended using an insulated string as given in figure. Find the angle made by string with vertical if it is placed in electric field of magnitude 2000 V/m towards right

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Achieve CUET (UG) Physics Practice Book>Chapter 1 - Electric Charges and Fields>Exercise>Q 51
Two point charges +8q and -2q are located at x=0 and x=L respectively. The location of a point on the x-axis at which the net electric field due to these two point charges is zero is