Question

10. If resultant of two unit vectors a and is also a
unit vector, then magnitude of difference of
a and b is
(1) Zero
(2) 1
(3) 3
(4) 2​

Answer 1

Answer:

Step-by-step explanation:

let two vectors are a,b then

resultant of sum = (a2 + b2 + 2abcos@)1/2 = 1               (given)

a = b = 1          (unit vector)

1+1+2cos@ = 1

     cos@ = -1/2           .................1

now resultant of difference = magnitude (a-b)

R = (a2 + b2 - 2abcos@)1/2

a = b = 1 , cos@ = -1/2 so

R = [ 1+1+1]1/2 = root3

Answer 2

Answer:

3

hope it helps you

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