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If vecB1,vecB2,vecB3 and vecB4 are the ...

If `vecB_1,vecB_2,vecB_3 and vecB_4` are the magnetic field due to current `I_1,I_2,I_3 and I_4`respectively then in ampere circuital law `ointvecB.dvecl=mu_0I`, `vecB` is

A

`vecB=vecB_1-vecB_2`

B

`vecB=vecB_2+vecB_4`

C

`B=vecB_1+vecB_2+vecB_3+vecB_4`

D

`vecB=vecB_2-vecB_3`

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