A conducting spherical shell has of 9.80 m and 1.20 m, as shown in the figure be

Question

A conducting spherical shell has of 9.80 m and 1.20 m, as shown in the figure below. The sphere carries on excess charge of -500 nC. A point charge of +300 nC in present at the center. what in the surface charge density on the spherical surface? 4.0 times 10^- c/m^2 -6.0 times 10^- c/m^2 -4.0 times 10^- c/m^2 6.0 times 10^- c/m^2 The figure below shown two concentric metal loops, each carrying a current. The larger loop carries a current of 8.0 A and has a radius of 0.060 m. The smaller loop has a radius of 0.040 m. What is the value of a current in the smaller loop that will result in zero total magnetic field at the center of the system? 2.2A 6A 12A 5.3A A beam of electrons moving at a speed of 8 times 10^4 m/s is un-deflected when it passes through an electric field of 10 N/C perpendicular to its path and a magnetic field that is perpendicular to its path and also to the electric field. Calculate the strength of the magnetic field. 1.25 times 10^4 T 7.81 times 10^-5 T 6.25 times 10^-10 T 1.6 times 10^-4 T A positive point charge of 10^-3 C is located 3 m from another positive point charge of 10^-5 C. What is the electric potential energy of the particles system?. 0.1 J 0.2 J 0.3 J zero

Explanation / Answer

13) v=E/B

B=E/v=10/80000=1.25*10^-4T

14) energy= q1*q2/4**€*r=(9*10^9*10^-3*10^-5)/3=30J

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