A long straight wire carrying current of $30\,A$ is placed in an external uniform magnetic field of induction $4 \times 10^{-4}$ $T$. The magnetic field is acting parallel to the direction of current. The magnitude of the resultant magnetic induction in tesla at a point $2.0\, cm$ away from the wire is
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(c) ${B_1} = 4 \times {10^{ - 4}}\,T$
${B_2} = {10^{ - 7}} \times \frac{{2 \times 30}}{{2 \times {{10}^{ - 2}}}}$$ = 3 \times {10^{ - 4}}\,T$
${B_2} = {10^{ - 7}} \times \frac{{2 \times 30}}{{2 \times {{10}^{ - 2}}}}$$ = 3 \times {10^{ - 4}}\,T$
${B_{{\rm{net}}}} = \sqrt {B_1^2 + B_2^2} $$ = 5 \times {10^{ - 4}}\,T$
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