AIPMT PRELIMS 2010 Physics Cathode Rays MCQ Question
A beam of cathode rays is subjected to crossed Electric (E) and Magnetic field (B). 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)
E² / 2VB²
B² / 2VE²
2VB² / E²
2VE² / B²
Correct Answer
Detailed Explanation
The specific charge q/m is derived from qV = 1/2 mv² and v = E/B, leading to q/m = E² / 2VB².
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