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An electron in a cathode-ray tube is accelerated through a potential difference of 10 kV then passes through the d=2.3-cm-wide region of uniform magnetic field in the figure

An electron in a cathode-ray tube is accelerated through a potential difference of 10 kV then passes through the d=2.3-cm-wide region of uniform magnetic field in the figure(Figure 1) 


Part A 

What field strength will deflect the electron by θ = 11°?

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