As we know that, magnetic field (B) produces only due to current i.e. flow of charge per unit time. But electric field is generated by any charged particle no matter it is static\/moving. Hence, we can say magnetic field exerts force only on moving charge but electric field exerts force on moving as well as static both. Force on a charged particle, F=Bqvsinθ For parallel motion, θ=0∘ or 180∘ ∴sin0∘=0 and 180∘=0 ∵F=0