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9)9. A nonconducting sphere of radius R has a uniform volume charge density ρ . At the surface of the sphere, the electric field strength is E. If a second sphere of radius 2R was created of the same material and with the same charge density, what would be the strength of the electric field at the surface of the second sphere?

18)Four conducting wires perpendicular to the plane of the page are at the corners of a square, as shown in cross p in the figure above. The wires carry equal currents in the same direction. What is the direction of the total magnetic force on wire X caused by the other three wires?

29)A small object with a charge of q = +3.0 μC and a mass m = 2.0?× 10-6 kg enters a magnetic field of magnitude B = 0.20 T directed into the page, as shown in the figure above. If the speed of the object is 1000 m/s , the object’s acceleration at the moment it enters the field is most nearly

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