Question

Answer q12 with explanation pls
option c is 5k^ and d is all of above

Answer 1

Answer:

all of the above

because the dot product (scalar product) of given vector with each is equal to zero

since dot product is zero,hence costheta is equal to zero

then equal to 90°

Answer 2

Answer:

B) option is correct

Explanation:

Perpendicular Vectors. Two vectors A and B are perpendicular if and only if their scalar product is equal to zero. Let A = (Ax , Ay) and B = (Bx , By) Vectors A and B are perpendicular if and only if A · B = 0.

ie.

  (acosθi^+bsinθj^)(1/asinθi^-1/bcosθj^)

 =acosθ(1/asinθ)-bsinθ(1/bcosθ)

 =sinθcosθ-sinθcosθ

 =0

hence option (b)is correct