A small sphere with mass 9.00 ug and charge -4.30 μC is moving in a circular orbit around a stationary sphere that has charge +7.50 µC. If the speed of the small sphere is 5.90 x 10³ m/s, what is the radius of its orbit? Treat the spheres as point charges and ignore gravity.

The image shows three charges fixed in place. The distance in the image is ? = 0.2 m and the charge is ? = 4×10−16 C An electron (not pictured) initially at point A has a speed of 106 m/s as it moves toward point B. What is the speed of the electron at point B?

A research Van de Graaff generator has a 1.90 m diameter metal sphere with a charge of 56.0 µC on it. An oxygen atom with three missing electrons is released near the Van de Graaff generator. What is its kinetic energy in keV at this distance?

Determine the initial acceleration of the dust particle.

Two-point charges Q1= 4.5 µC and Q2= 8.5 µC are initially very far apart. They are then brought together, with a final separation of 3.5 mm. How much work does it take to bring them together?

A proton with a kinetic energy of 1.63 keV (1eV-1.602.10-19 J), that is at height 24.9 cm above a horizontal charged nonconducting plate with surface charge density - 3.60 μ C/m², is fired horizontally across this plate. What is the height of the proton after it has traveled a horizontal distance of 3.56 cm? 18.6 cm O 13.8 cm O 20.9 cm O 15.4 cm O 20.2 cm Save for Later Submit Answer

A parallel plate capacitor has a surface charge density of magnitude o = 0.00433 C/m² on each plate. A small sphere, charged to Q = 9.40 × 10-6 C and located between the plates, undergoes a displacement of magnitude d = 0.143 m. Refer to the figure, which is not drawn to scale. y +++++++ Using the symbols in the palette, not their numeric equivalents, enter an expression, in Cartesian unit-vector notation, for the electric field within the capacitor. If the displacement is from left to right, then how much work, in joules, is performed on the sphere by the electric field? At what speed, in meters per second, is the sphere moving when it completes the displacement if it starts from rest and its mass is 0.115 kg? X

Consider an object of mass 41.8 kg. Now imagine taking all the protons out of the object and stuffing them into a box. Also take all the electrons out of the object and stuff them in a second box. How much charge is contained in the box with all the protons?     8.00E+09 C     1.00E+09 C     2.00E+09 C     4.00E+09 C

Two large parallel plates carry opposite charges of equal magnitude. They are separated by 80.0 mm and the potential difference is 120 V. What is a magnitude of the uniform electric field in the region between the plates?

10 nC B. A -5 nC How much work must you do to move an electron from A to B? The rectangle is 14.6 cm high and 24.8 cm wide. Remember that negative work means that we can get work out of the process. In 1911, Ernest Rutherford and his assistants Geiger and Marsden conducted an experiment in which they scattered alpha particles (nuclei of helium atoms) from thin sheets of gold. An alpha particle, having charge +2e and mass 6.64 x 10-27 kg, is a product of certain radioactive decays. The results of the experiment led Rutherford to the idea that most of an atom's mass is in a very small nucleus, with electrons in orbit around it. Assume an alpha particle, initially very far from a stationary gold nucleus, is fired with a velocity of 2.98 × 107 m/s directly toward the nucleus (charge +79e). What is the smallest distance between the alpha particle and the nucleus before the alpha particle reverses direction? Assume the gold nucleus remains stationary. fm