Answer:
I think the answer is option D ...
bt I m not sure..
Answer:
a) 1273.23 A/m^2
b) 7.19*10^-5 m/s
c) 236881.7 Ohms
Explanation:
(a) To find the current density you use the following formula:
I: current in the wire
A: cross area of the wire
r: radius of the wire
(b) The electron drift speed is given by:
n: number of conduction electrons per m^3
q: charge of the electron = 1.6*10^-19C
The number of free electrons is calculated by using:
Next, you replace the values of the parameters in the equation for vd:
(c) The conductivity is given by:
You first calculate R:
Next, replace for sigma:
V^2 = vi^2 + 2as
vi = 0 in this case
a = 9.8 m/s^2
So,
V^2 = 2 * 9.8 * 490
v = 98.05 m/s
hope this helps
The correct answer is A) When a magnet moves near a wire, it's charging field causes the electrons in the wire to flow as electric current