Q.

(A) : Electric current density is a vector
(R) : A physical quantity having magnitude and direction should be always a vector

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a

Both (A) and (R) are true and (R) is the correct explanation of (A)

b

Both (A) and (R) are true and (R) is not the correct explanation of (A)

c

(A) is true but (R) is false

d

Both (A) and (R) are false

answer is C.

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Detailed Solution

Electric current density is a vector.

A physical quantity, having magnitude and direction , must have to follow vector law of addition to be a vector.  

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(A) : Electric current density is a vector(R) : A physical quantity having magnitude and direction should be always a vector