Question

A cube made of wire of equal length is connected to a battery as shown in the figure. The magnetic field at the centre of the cube is:

• A. $\frac{12}{\sqrt{2}}\frac{{\mu }_{0}I}{\pi L}$
• B. $\frac{6{\mu }_{0}I}{\sqrt{2}\pi L}$
• C. $\frac{6{\mu }_{0}I}{\pi L}$
• D. Zero

Answer 1

Answer: (D)

Zero

Magnetic field produced by one side is cancelled by field produced by its opposite side.( due to symmetric figure)

Hence, net$\left|B\right|=0$.