A 0.900-V potential difference is maintained across a 1.50-m length of tungsten wire that has a cross-sectional area of 0.700 mm2. What is the current in the wire?

Explanation:

Current can be determined by Ohm's Law, whose expression is:

Where is the electrical resistance, whose formula is described below:

Where , and are the electrical resistivity and wire length and cross area, respectively. The electrical resistivity for tungsten is . Finally, the electrical resistance is computed herein:

Moreover, the current in the wire is:

see the picture for the vector

the magnitude of the vector by pythagorean theorem

r = √( (-10)^2 + (3)^2 ) = √109

magnitude = √109 units

the direction angle between vector and x-axis is

tan^(-1)(3/10) = 16.699

so the direction is approximately 16.7 degrees north of west