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Q.

p a¯ is a vector perpendicular to i¯ and j¯  whose magnitude is 2 where 'p' is a scalar,  then

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a

a¯=k¯ and a¯=p

b

a¯=2pk¯ and a¯=2p

c

a¯=2pk¯ and a¯=2p

d

a¯=pk¯ and a¯=p2

answer is B.

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Detailed Solution

Pa || i×j    Pa=λ(k)                        |Pa|  =|λ| |k|   λ=±2 Pa=±2k     a=±2P k

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