原题:为了降低潜艇噪音,提高其前进速度,可用电磁推进器替代螺旋桨.潜艇下方有左、右两组推进器,每组由6个相同的用绝缘材料制成的直线通道推进器构成,其原理示意图1如下.在直线通道内充满电阻率ρ=0.2Ω·m的海水,通道中a×b×c=0.3 m×0.4 m×0.3m的空间内,存在由超导线圈产生的匀强磁场,其磁感应强度B=6.4T、方向垂直通道侧面向外.磁场区域上、下方各有a×b=0.3m×0.4m的金属板M、N,当其 Original title: In order to reduce the submarine noise and improve its forward speed, the propeller can be replaced by an electromagnetic thruster.At the bottom of the submarine there are left and right groups of thrusters, each consisting of six identical linear channel thrusters made of insulating material, The schematic diagram of the principle 1 is as follows: In a linear channel filled with seawater with a resistivity ρ = 0.2 Ω · m and a × b × c = 0.3 m × 0.4 m × 0.3 m in the channel, Strong magnetic field, the magnetic induction intensity B = 6.4T, the direction of the vertical side of the channel outward .On the magnetic field region, there are a × b = 0.3m × 0.4m of the metal plate M, N,