A wire along the z axis carries a current of 6.4 A in the z direction Find the magnitude and direction of the force exerted on an 8.0 cm long length of the wire by a uniform magnetic field with magnitude 0.50 T in the x direction

The magnetic force will be 0.256 N in +y direction.                                          

Explanation:

It is given that, a wire along the z axis carries a current of 6.4 A in the z direction. Length of the wire is 8 cm. It is placed in uniform magnetic field with magnitude 0.50 T in the x direction.

The magnetic force in terms of length of wire is given by :

For direction,

So, the magnetic force will be 0.256 N in +y direction.

there are no correct statementd on the list of choices you provided.

no. dot product   =0 when vecs at right angles