1.

The unit of electric current ?ampere? is the current which when flowing through each of two parallel wires spaced 1 m apart in vacuum and of infinite length will give rise to a force between them equal to [BIT 1987; CBSE PMT1998; MP PET 1999; MP PMT 2002]

A.            \[1\,N/m\]                            
B.            \[2\times {{10}^{-7}}\,N/m\]
C.            \[1\times {{10}^{-2}}\,N/m\]
D.            \[4\pi \times {{10}^{-7}}\,N/m\]
Answer» C.            \[1\times {{10}^{-2}}\,N/m\]


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