A 150 V battery is connected across two parallel metal plates of area 28.5 cm and separation 9.20 mm. A beam of alpha particles (charge +2e, mass 6.64 x 10-27 kg) is accelerated from rest through a potential difference of 1.75 kV and enters the region between the plates perpendicular to the electric field, as shown in (Figure 1). Figure + > & Provide 4 Part A What magnitude of magnetic field is needed so that the alpha particles emerge undeflected from between the plates? Express your answer with the appropriate units. ? B=Value Units Units input for part A Submit Previous Answers Request Answer X Incorrect; Try Again; 3 attempts remaining