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#balochistantextbookboard #balochistan 1. A strong lightning bolt transfers about 20C to Earth. Calculate the number of electrons transferred to Earth. 2. The charge of how many electrons would be equal to 80μC. The magnitude of charge on an electron is 1.6×〖10〗^(-19) C. 3. Two point charges 15μC and 45μC are placed at a distance of 180cm. What is the magnitude of Coulomb force between these two charges? 4. The separation between two protons inside an item is 4×〖10〗^(-15) m. If the charge on proton is 1.6×〖10〗^(-19) C. Calculate repulsive force between these two protons. 5. Two identical positive charges are separated by 15cm. Find the magnitude of each charge if they repel each other with the force of 10N. 6. A negative charge with magnitude 5μC attracts a second charge with a force of 27N. If second charge is 10cm away from the first charge, find the magnitude of second charge. 7. Find the separation between two point charges of 5μC and 9μC charge if the Coulomb’s force between them is 1.62N. 8. A test charge is placed in an electric field intensity of 1.5×〖10〗^8 〖NC〗^(-1). If test charge experiences a force of 0.3N, find the magnitude of the charge. 9. The capacitance of a parallel capacitor is 330μF. What will be the charge on its plates if it is connected across a 6V battery? 10. Potential difference between two parallel plate capacitor is 200V, if charge stored in the capacitor is 300μC. Find the value of capacitance. 11. Three capacitors having values 2.2μF, 5.6μF and 8.2μF are connected in parallel. If the potential difference is 6V then find (i) Equivalent capacitance (ii) Potential difference across capacitors (iii) charge on each capacitor. 12. Three capacitors of capacitances 2μF,3μF and 6μF respectively are connected in: (a) in parallel (b) in series Find the equivalent capacitance in each case.