consider the differences between a horseshoe magnet and a bar magnet. Is the attraction or repulsion going to be stronger or weaker between two horseshoe magnets or two bar magnets, as shown here? how would that influence the density of magnetic field lines?

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If the heat engine is a perfect carnot cycle engine, thenefficiency = (t2-t1)/t2   where t1=temperature of cold reservoir ( ° k) = 135            t2=temperature of hot reservoir ( ° k)   = 325thereforeefficiency = (t2-t1)/t2 = (325-135)/325 = 0.5846 = 58%  note: this is the theoretical maximum efficiency of a perfect heat engine.   real-life engines do not achieve this value.