You hold a wire coil so that the plane of the coil is perpendicular to a magnetic field b⃗. part a if the magnitude of b⃗ increases while its direction remains unchanged, how will the magnetic flux through the coil change? check all that apply. check all that apply. the flux is unchanged because the position of the coil with respect to b⃗ is unchanged. the flux increases because the magnitude of b⃗ increases. the flux decreases because the magnitude of b⃗ increases. the flux is unchanged because the surface area of the coil is unchanged.