If the planes \[x+2y+kz=0\] and \[2x+y-2z=0\] are at right angles, then the value of k is [MP PET 1999]

If the planes \[x+2y+kz=0\] and \[2x+y-2z=0\] are at right angles, the

1.	If the planes \[x+2y+kz=0\] and \[2x+y-2z=0\] are at right angles, then the value of k is [MP PET 1999]
A.	\[-\frac{1}{2}\]
B.	\[\frac{1}{2}\]
C.	? 2
D.	2
Answer» E.

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If the planes \[x+2y+kz=0\] and \[2x+y-2z=0\] are at right angles, then the value of k is [MP PET 1999]

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