4. A 150-V battery is connected across two parallel metal plates of area 28.5 cm? and separation 8.20 mm. A beam of alpha particles (charge +2e, mass 6.64 x 1027 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. What magnitude and direction of magnetic field are needed so that the alpha particles emerge undeflected from between the plates?

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4. A 150-V battery is connected across two parallel metal plates of area 28.5 cm² and separation
8.20 mm. A beam of alpha particles (charge +2e, mass 6.64 x 1027 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. What magnitude and direction of magnetic field are needed so that the alpha
particles emerge undeflected from between the plates?
Transcribed Image Text:4. A 150-V battery is connected across two parallel metal plates of area 28.5 cm² and separation 8.20 mm. A beam of alpha particles (charge +2e, mass 6.64 x 1027 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. What magnitude and direction of magnetic field are needed so that the alpha particles emerge undeflected from between the plates?
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