A jet plane of wing span 20 m is travelling towards west at a speed of `400 m s^(-1)`. If the earth's total magnetic field is `4 xx 10^(-4)` T and the dip angle is `30^(@)`, at that place, the voltage difference developed across the ends of the wing is

Options

A. 3.2 V
B. 6.4 V
C. 1.6 V
D. 0.8 V

Answer

C

Explanation

Here, `v=400 ms^(-1)`,
D= distance between the ends of wings=20 m
`B=4 xx 10^(-4)` T, angle of dip, `delta=30^(@)`
Motional emg, `epsilon=B_(v)vl`
`=4 xx 10^(-4) xx sin 30^(@) xx 400 xx 20=3.2 xx (1)/(2)=1.6 V`