19. What is the capacitance of a spherical capacitor with an inner radius of 5.0 and...

    

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19. What is the capacitance of a spherical capacitor with an inner radius of 5.0" and an outer radius of 6.0"? (Hint: 1" = 25.4 mm) 20. Suppose that the electric potential along the z-axis between two conductors located at +a and -a is given by: V(z) = ke Q z (3 a - z) a4 What is the capacitance between the conductors? 21. A cathode-ray tube has a beam current of 210 A. How many electrons hit the screen in 7.5 s? 22. A metallic conductor has a resistivity of 2.2 107 2.m. What is the resistance of a sample that is 3.5 m long and has a uniform cross-section of 4.0 10-6 m? 19. What is the capacitance of a spherical capacitor with an inner radius of 5.0" and an outer radius of 6.0"? (Hint: 1" = 25.4 mm) 20. Suppose that the electric potential along the z-axis between two conductors located at +a and -a is given by: V(z) = ke Q z (3 a - z) a4 What is the capacitance between the conductors? 21. A cathode-ray tube has a beam current of 210 A. How many electrons hit the screen in 7.5 s? 22. A metallic conductor has a resistivity of 2.2 107 2.m. What is the resistance of a sample that is 3.5 m long and has a uniform cross-section of 4.0 10-6 m?