A beam of cathode rays is subjected to crossed electric (E) and magnetic (B) fields. The fields are adjusted such that the beam is not deflected. The specific charge of the cathode rays is given by (where V is the potential difference between cathode and anode)

Question

Dr. Abubacker · Accepted Answer

[Solution from source] No deflection means eE = evB, so v = E/B. Accelerated through V: eV = ½mv², so e/m = v²/(2V) = E²/(2VB²). The inverted forms come from writing v = B/E. Answer (1).

Q. A beam of cathode rays is subjected to crossed electric (E) and magnetic (B) fields. The fields are adjusted such that the beam is not deflected. The specific charge of the cathode rays is given by (where V is the potential difference between cathode and anode)

Explanation

Reviewed by Dr. Abubacker

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