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A large electromagnet is to be used to generate the required 𝑩⃑⃑ -field in a mass spectrometer device. The parallel plates that make up the velocity selector portion of the device have an electric field strength of 𝜀 = 345 N/C, while the accelerating plates (10 sets in total) have a strength 𝜀 = 265 N/C and each... show more A large electromagnet is to be used to generate the required 𝑩⃑⃑ -field in a mass
spectrometer device. The parallel plates that make up the velocity selector portion of the
device have an electric field strength of 𝜀 = 345 N/C, while the accelerating plates (10
sets in total) have a strength 𝜀 = 265 N/C and each have a separation of 5.00 cm.
Electrons are accelerated through the device and detected on a detecting screen as
discussed in class.
a) Draw a schematic representation of the device. Make sure to include the direction
of 𝜺⃑ -field and the 𝑩⃑⃑ -field and include 2 equipotential lines inside the velocity
selector; what is the significance of the spacing between any two lines?
b) If the electromagnet has a length of 30.0 cm and is supplied 3.00 mA, how many
turns are needed to produce the B-field required to select only those electrons that
were accelerated from rest? The magnitude of the magnetic field generated by a solenoid is
𝐵 = 𝜇𝑜(𝑁/𝐿)𝐼
c) Where will the electrons be located, relative to where they entered the detecting
region?
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