Using Ohm’s Law, V=IR, rearrange to find current: I= V/r = 12V4Ω=3A.
The magnetic field (B) around a current-carrying wire is directly proportional to the current (I), as described by Ampere’s Law: B∝I. If the current doubles, the magnetic field also doubles.
The electrostatic force is given by Coulomb’s Law: F=k r 2∣q 1 q 2 ∣/r2 .
In a series circuit, resistances add directly: 𝑅total=𝑅1+𝑅2+⋯+𝑅𝑛.
According to Faraday’s Law of Electromagnetic Induction, the induced voltage depends on the rate of change of magnetic flux, the strength of the magnetic field, the number of coil turns, and the motion of the coil. Resistance affects the current, not the voltage.
