In this lesson, we will learn how to calculate the forces that electrically charged objects exert on each other, including the net force from multiple charges.
Q1:
An object with a charge of 𝑞=−150mC is positioned 8.8 cm directly below an object with a charge of 𝑞=75mC, as shown in the diagram. On either side of the negatively charged object, at a distance of 6.3 cm, are objects with the charges 𝑞=𝑞=21mC. Find the magnitude of the net electrical force acting on the negatively charged object. Use 8.988×10 N⋅m2/C2 for the value of Coulomb’s constant. Give your answer in scientific notation to one decimal place.
Q2:
An object with a charge 𝑞 attracts two other objects that have the charges 𝑞 and 𝑞, as shown in the diagram. The force 𝐹 that 𝑞 exerts on 𝑞 is twice the force 𝐹 that 𝑞 exerts on 𝑞. The distance from 𝑞 to 𝑞 is 752 µm and the distance from 𝑞 to 𝑞 is 342 μm. If 𝑞=−12mC, find 𝑞. Give your answer to one decimal place.
Q3:
Two positively charged spheres are separated by a distance of 8.5 mm, as shown in the diagram. One sphere has a 20 mC charge and the other has a 10 mC charge. The sphere with the 10 mC charge has a force F exerted on it. Find F. Use 8.988×10 N⋅m2/C for the value of Coulomb’s constant. Give your answer in scientific notation to one decimal place.
Nagwa uses cookies to ensure you get the best experience on our website. Learn more about our Privacy Policy.
