### Physics 10 Chapter 13 - Electrostatics - 11

 1.    What is the value of ‘K’, if the medium between the two charges is air?a) 9 ×109 Nm2 C-2 b) 10 ×108 Nm2 C-2c) 10 ×109 Nm2 C-2d) 9 ×108 Nm2 C-2
 2.    According to Coulomb’s law, what happens to the attraction of two oppositely charged objects as their distance of separation decreases?a) Cannot be determined b) Remains unchangedc) Increasesd) Decreases
 3. In which medium, the value of ‘K’ is 9 ×109 Nm2 C-2?a) Air b) Meccac) Copperd) Gasoline
 4.    What is true about point charges?a) Sizes are equal to the distance between them b) Sizes are very small as compared to distance between themc) Distance between them is equal to their sizesd) Distance between them is very small as compared to sizes
 5.    Which of the following law, electric forces obey?a) Newton’s third law of motion b) Newton’s second law of motionc) Newton’s first law of motiond) Newton’s law of gravitation
 6.    The Coulomb’s law is valid for the charges which are.........?a) Moving and non-point charges b) Moving and point chargesc) Stationary and large size chargesd) Stationary and point charges
 7.    A positive and a negative charge are initially 4 cm apart. When they are moved closer together so that they are now only 1 cm apart, the force between them is......................?a) 4 times larger than before b) 4 times smaller than beforec) 8 times larger than befored) 16 times larger than before
 8.    Two bodies are oppositely charged with 500 µC and 100 µC charge. Find the force between the two charges if the distance between them in air is 0.5 m?a) 180 N b) 1800 Nc) 50,000 Nd) 5000 N
 9.    If the charge qo is moved away from q, this force would.....................?a) Increase b) Not producedc) Have no effectd) Decrease
 10.    What is the SI unit of ‘K’?a) Nm-2 C-2 b) Nm2 C2c) Nm-2 C2d) Nm2 C-2
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