7 m/s in a circular orbit around a stationary particle with a charge of -5 times

Question

7 m/s in a circular orbit around a stationary particle with a charge of -5 times 10^-6 C. The radius of the orbit is: 0 0.23 n 0.62 n 1.6 m 4.4 m The units of the electric field are: J/(C middot m) J/C J middot C/m none of these Two thin spherical shells, one with radius R and the other with radius 2R, surround an isolated charge point particle. The ratio of the number of field lines through the larger sphere to the number through the smaller is: 1 2 4 1/2 1/4 The diagram shows the electric field lines due to two charged parallel metal plates. We conclude that: the upper plate is positive and the lower plate is negative a proton charge at X would experience the same force if it were placed at Y a proton charge at X experiences a greater force than if it were placed at Z a proton charge at X experiences less force than if it were placed at Zelectron charge at X could have its weight balanced by the electrical force

Explanation / Answer

18. the unit is N/C which can also be written as J/C.m

19. The ratio will be 1 as the number of field lines do not depend on the surface area but the charge of the independent particle.

20. B , as the seperation between lines is same hence the applied force will be same.

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