A beam containing a mixture of singly charged carbon isotopes, 12C+^{12}\text{C}^+12C+ and 14C+^{14}\text{C}^+14C+, is accelerated from rest through a potential difference VVV. The ions then enter a velocity selector with a uniform electric field E E\,E directed downwards and a uniform magnetic field B B\,B pointing into the page.
The fields are adjusted so that the 12C+^{12}\text{C}^+12C+ ions pass through undeflected.
Which statement correctly describes the behavior of the 14C+^{14}\text{C}^+14C+ ions inside the velocity selector?
They curve downwards towards the negative plate because they are slower than the 12C+^{12}\text{C}^+12C+ ions, resulting in a magnetic force that is weaker than the electric force.
They curve upwards towards the positive plate because they are slower than the 12C+^{12}\text{C}^+12C+ ions, resulting in a magnetic force that is stronger than the electric force.
They curve downwards towards the negative plate because they are faster than the 12C+^{12}\text{C}^+12C+ ions, resulting in a magnetic force that is weaker than the electric force.
They curve upwards towards the positive plate because they are faster than the 12C+^{12}\text{C}^+12C+ ions, resulting in a magnetic force that is stronger than the electric force.