The two rails of a rail–gun arrangement are apart and connected through a resistor

PHYSICS · Single correct · A Level · Physics · Fields and their consequences · Fields and their consequences

Problem

The two rails of a rail–gun arrangement are 0.50 m0.50\,\text{m} apart and connected through a 1.5 Ω1.5\,\Omega resistor. A conducting rod is pulled along the rails with a steady speed of 5.0 m s−15.0\,\text{m\,s}^{-1} in a region where a uniform magnetic field of 0.30 T0.30\,\text{T} is directed vertically downward. Neglecting friction, determine the magnitude of the horizontal force that must be applied on the rod to keep its speed constant. (a) 0.15 N0.15\,\text{N} (b) 0.0375 N0.0375\,\text{N} (c) 0.075 N0.075\,\text{N} (d) 0.30 N0.30\,\text{N}

Related theory

Browse the problem library