4) A charge Q- +9 nc generates an electric field E at a point P, that is a dista

Question

4) A charge Q- +9 nc generates an electric field E at a point P, that is a distance r 9.0 m distance from the charge. Calculate the magnitude of the electric field E at the point P. (10 points) 5) For the charge in Problem #5, calculate the electric potential at the same point P. (10 points) 6) The electrical resistivity of copper (cu) metal is po T-20°c) I. 7 x 10 s2.cm at 20 oct. The temperature coefficient of electrical resistivity for cu is, a 390 x 10 5 o Calculate the C magnitude of the electrical resistivity of Cu at a temperature of 60 °C. The temperature dependence of the resistivity is given by p() poll aATI. (0 points) 156 P z 3.12.

Explanation / Answer

4)

E = k*q/r^2

= 9*10^9*9*10^-9/9^2

= 1 N/C

5) V = k*Q/r

= 9*10^9*9*10^-9/9

= 9 volts

6)

rho = rho_o*(1 + alfa*delta_T)

= 1.7*10^-6*(1 + 390*10^-5*(60 - 20))

= 1.965*10^-6 ohm.m

7) E = delta_v/d

= 1000/(1*10^-3)

= 1*10^6 N/c

8) a = F/m

= q*E/m

= 1.6*10^-19*1*10^6/(9.11*10^-31)

= 1.756*10^17 m/s^2

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