Consider a vector F = 4 i – 3 j. Another vector that is
perpendicular to F is
(a) 4 i + 3 j (b) 6 i
(c) 7 k (d) 3 i – 4 j
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check the angle by applying the principle of dot product
by that u will find that cos(a) becomes 0 when [(4i-3j).(3i-4j)]/5*5=0
comes so a becomes 90 so ans (d) is the correct option
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