Q. Two charges are placed at a certain distance. If the magnitude of each charge is doubled the force will become 1/4th of its original value1/8th of its original value4 times of its original value8 times of its original value Answer: 4 times of its original value

Q. 1 pico farad (1pF) is equal to 1×10-9F1×10-12F1×10-6F1×10-10F Answer: 1×10-12F

Q. Value of k in coulomb's law depends upon magnitude of chargesdistance between chargesboth A and Bmedium between two charges Answer: medium between two charges

Q. To relieve discomfort of allergy sufferers in homes, we use vacuum cleanerelectrostatic air cleanerwind cleanernone of the above Answer: electrostatic air cleaner