(Solved): The friends' discussion turns to a comparison of the magnetic field due to a current and the electri ...
The friends' discussion turns to a comparison of the magnetic field due to a current and the electric field due to a polint charge. Which of Mira's statements regarding this comparison is false? "An electric field is established by an isolated electric charge. The Biot-Savart law glves the magnetic field of an isolated current element at some point, but such an isolated current element cannot exist the way an isolated electric charge can." The magnetic field due to a eurrent distribution can be calculated directly from
vec(b)=(\mu _(0))/(4\pi )(1(vec(s))x(vec(r)))/(r^(2))and the electric field due to a point charge can be calculated directly from
E=(k_(4)Q_(2))/(r_(2)). The direction of the electric field created by a point charge is radial, but the magnetic field created by a current element is perpendicular to both the length element ofs and the unit vector ir," "The magnitude of the mapnetic field due to a current element varies as the inverse square of the distance from the source, as does the electric field due to a point charge."
