Question

The wing span of an airplane is 20 m. The potential difference across the tips of the wings must
not be more than 20 V. If the magnetic field of earth can reach a maximum of 0.01 tesla, the maximum speed of the
airplane must be:
(A) 540 km/hr
(B) 360 km/hr
(C) 100 km/hr
(D) None of these​

Answer 1

Answer:

ANSWER

Given,

Wing span, L=20m

Magnetic Field

B

⇀

= 5×10

−5

T

1 mile=1.6 kilometer

Velocity, v=360 miles/h= 360×1.6 =576 km/s

v= 160 m/s

Potential Difference, V=BLv=5×10

−5

×20×160=0.16 V

Potential difference is 0.16V