Correct answer: 1 volt
Explanation:
By definition, electric potential (voltage) is the work done per unit charge to move a charge between two points. Mathematically, \[ \text{Voltage (V)} = \frac{\text{Work (Joule)}}{\text{Charge (Coulomb)}} \] So, \[ 1 \ \text{volt} = \frac{1 \ \text{joule}}{1 \ \text{coulomb}} \]
Hence, the correct answer is: 1 volt.
An infinitely long straight wire carrying current $I$ is bent in a planar shape as shown in the diagram. The radius of the circular part is $r$. The magnetic field at the centre $O$ of the circular loop is :
