1. A charge Q is divided into two parts q and Q-q and separated by a distance R. The force of repulsion between them will be maximum when:




... Answer is C. q = Q/2
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2. Three objects are brought close to each other, two at a time. When objects A and B are brought together, they attract. When objects B and C are brought together, they repel. From this, we conclude that




... Answer is B. objects A and C possess charges of opposite signs.
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3. Object A has a charge of +2 µC, and object B has a charge of +6 µC. Which statement is true about the electric forces on the objects?




... Answer is B. `\F_{AB}` = -`\F_{BA}`
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4. Some charge is given to a conductor. Then it's potential




... Answer is C. Is remain the same throughout the conductor
E = 🛆V/🛆A -- inside the conductor E = 0 ----🛆V = 0 V₂ = V₁


5. The unit of Electric field intensity is :




... Answer is D. All of these
Option D written in the book as Voltmetre is wrong because Volt/metre, newton/Coulomb and Joule/ Coulomb.metre are all units of E, So replace it with all of these.


6. A proton is about 1840 times heavier than an electron. When accelerated by a potential difference if 1 kV, its kinetic energy will be:




... Answer is C. 1 kev
🛆U = 🛆 K.E = q 🛆V when q = 1 e and 🛆V = 1 kV so 🛆 K.E = 1 keV


7. The electric field at a distance of 20 cm from 2 µC charge is:




... Answer is A. 3ｘ10⁵ N
E = `\ frac{Kq}{r^2}` by putting values we get E = 4.5ｘ10⁵ All the options given in the are wrong so replace anyone let option A with 4.5ｘ10⁵ N


8. An electric charge q is placed at the centre of a cube of the side "a". The electric flux on its one side will be



... Answer is A. `\frac {q}{6ε₀}`
Gauss's law Ñ„ = Q /ε₀ Cube has 6 face For one face Ñ„ = (1/6)(Q /ε₀) = q/6ε₀


9. The electric flux through the surface of a sphere due to a charge q placed at its centre depends upon




... Answer is D. the quantity of charge inside the sphere
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10. A one microfarad capacitor of a TV is subjected to a 4000 V potential difference. The energy stored in the capacitor is




... Answer is A. 8 J
using formula U = 1/2 CV²


11. In the figure below, the charge on the 3 µF capacitors is




... Answer is B. 10 µC
Using Q = Ce V and Ce = 1/C1 +1/C2 + 1/C3 -------In book options are given in F (farad) which is incorrect because we are asked to find Charge so replace F with C.


12. Two parallel metal plates are 8.00 m apart. The electric field between the plates is uniform, directed toward the right, and has a magnitude of 4.00 N/C. If an ion of charge +2e is released at rest at the left-hand plate, what is its kinetic energy when it reaches the right-hand plate?
 




... Answer is B. 64 eV
🛆 K.E = q 🛆V where 🛆V = E. 🛆r So 🛆 K.E = q (E. 🛆r) = 2e x 4 N/C x 8 m = 64 eV


13. The electric potential between two points A and B are ΔV. The work done W by the field in moving a charge from A to B is




... Answer is B. W = qΔV
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