Question

which of the following vector is perpendicular to the vector A=2i+3j+4k​

Answer 1

Dot products of two perpendicular vectors is zero.

Hence

2x + 3y = -4z

In option (d) value of x, y and z is 1, 2 and -2 respectively.

Substitute these values in above equation

2(1) + 3(2) = -4(-2)

2 + 6 = 8

8 = 8

Hence option (d) is correct.