A metallic cube of side 15 cm moves along +y at 2 m s⁻¹ in a uniform magnetic field 0.5 T along +z. The equilibrium potential difference between the higher- and lower-potential faces i $s ______$ mV.

Question

A metallic cube of side 15 cm moves along +y at 2 m s⁻¹ in a uniform magnetic field 0.5 T along +z. The equilibrium potential difference between the higher- and lower-potential faces i s ______ mV.

G1 Physics · Accepted Answer

At equilibrium, electric force balances magnetic force: qE = qvB, so E = vB. Potential difference across side l is ΔV = El = vBl. ΔV = 2×0.5×0.15 = 0.15 V = 150 mV. Final value: 150