1)Find the potential difference between the wing tips of a aircraft induced by i
ID: 1402245 • Letter: 1
Question
1)Find the potential difference between the wing tips of a aircraft induced by its motion through the earth’s magnetic field. The total wing span of the airplane is 90 m and its speed is 300 m/s in a region where the vertical component of the earth’s field has the magnitude is 3 x 10-5 T. (show work)
2) A twelve turn coil 10 cm in diameter has its axis parallel to a magnetic field of 0.5 T which is produced by a nearby electromagnet. The current in the electromagnet is cut off, and as the field collapses, an average emf of 8 V is induced in the coil. What was the length of time required for the field to disappear? (show work)
Explanation / Answer
1) Induced emf = B*v*L (here B is magnetic filed, v is speed and L is wing span)
= 3*10^-5*300*90
= 0.81 volts
2) induced emf = change in megnatic flux/time taken
==> time taken = change in megnatic flux/induced emf
= N*A*dB/emf
= 12*(pi*0.1^2/4)*(0.5-0)/8
= 5.89*10^-3 s or 5.89 ms
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