1.

A power line lies along the east-west direction and carries a current of 10 ampere. The force per metre due to the earth's magnetic field of \[{{10}^{-4}}\,tesla\] is                                                [Roorkee 1992]

A.            \[{{10}^{-5}}N\]                  
B.            \[{{10}^{-4}}N\]
C.            \[{{10}^{-3}}N\]                  
D.            \[{{10}^{-2}}N\]
Answer» D.            \[{{10}^{-2}}N\]


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