3) You have a neutral balloon. What is its charge after 14000 electrons have bee
ID: 1660835 • Letter: 3
Question
3) You have a neutral balloon. What is its charge after 14000 electrons have been removed from it? The elemental charge is 1.6 × 1019 C. Answer in units of µC.
4a)Two pellets, each with a charge of 4 × 106 C, are located 0.03 m apart. What is the electric force between them? The value of the Coulomb constant is 8.99 × 109 N · m2 /C 2 and the universal gravitational constant is 6.67259 × 1011 m3 /kg · s 2 . Answer in units of N.
b)What mass would experience this same gravitational force? Answer in units of kg.
8)Two small metallic spheres, each of mass 0.3 g are suspended as pendulums by light strings from a common point as shown. The spheres are given the same electric charge, and it is found that the two come to equilibrium when each string is at an angle of 4 with the vertical. If each string is 17.9 cm long, find the magnitude of the charge on each sphere. The Coulomb constant is 8.98755 × 109 N · m2 /C 2 and the acceleration of gravity is 9.81 m/s 2 . Answer in units of nC.
11)If the ball is in equilibrium when the string makes a 31.9 angle with the vertical, what is the net charge on the ball? The acceleration due to gravity is 9.8 m/s 2 , and the Coulomb constant is 8.98755 × 109 N · m2 /C 2 . Answer in units of µC.
Explanation / Answer
3)
removing electron will give it positive charge
Q = n*|e|
where n is number of electrons removed
e = charge of one electron
Q = n*|e|
= 14000*(1.6*10^-19)
= 2.24*10^-15 C
= 2.24*10^-9 uC
Answer: 2.24*10^-9 uC
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