The figure Figure 1 shows a thin rod of length L with total

The figure (Figure 1) shows a thin rod of length L with total charge Q.

Part A

Find an expression for the electric field strength on the axis of the rod at distance r from the center.

Express your answer in terms of the variables L, Q, r, and appropriate constants.

E=_________
Part C
Evaluate E at r = 3.8 cm if L = 5.0 cm and Q = 3.0 nC .

Express your answer to two significant figures and include the appropriate units.

E=_________

Solution

PARTA)

E=1/4*pi*epsilon *(Q/(r²-L²/4))

PART C)

substitute values in above equation

E=9*10⁹*3*10^-9/(3.8²-2.5²)*10^-4

=27*10⁴/8.19

=3.29*10⁴N/C