A car antenna is 15 m long The car is moving at 40 mph under

A car antenna is 1.5 m long. The car is moving at (40 mph) under a DC high-tension wire with (100 amp) (the distance between the wire and the top of the antenna is 10m) . What emf is induced in the antenna and what is its polarity ?

Solution

emf is induced in the antenna = VBL

40mph = 17.881 m/s , B = u0I/(2piR)   

=> emf = 17.881*4*3.14*10^-7100*1.5)/(2*3.14*10) = 0.000053643 V = 53.64 uV

polarity will be in (VxB) direction