A point (p,q,r) lies on the plane →r⋅(^i+2^j+^k)=4. The value of q – InterviewSolution

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1.	A point (p,q,r) lies on the plane →r⋅(^i+2^j+^k)=4. The value of q such that the vector →a=p^i+q^j+r^k satisfies the relation ^j×(^j×→a)=→0, is
Answer» A point $(p, q, r)$ lies on the plane $\to r \cdot (^i + 2^j +^k) = 4$ . The value of $q$ such that the vector $\to a = p^i + q^j + r^k$ satisfies the relation $^j \times (^j \times \to a) = \to 0,$ is

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