[" 4.As the bar shown in figure moves in...

[" 4.As the bar shown in figure moves in a direction perpendicular to the field,is an extemal force "],[" required to keep it moving with constant speed."],[qquad [longrightarrow,x],[x,x]],[[x,x],[x," Fig."27.31]]

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[" 4.As the bar shown in figure moves in a direction perpendicular to the field,is an extemal force "],[" required to keep it moving with constant speed."],[qquad [longrightarrow,x],[x,x]],[[x,x],[x," Fig."27.31]]

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