AIPMT PRELIMS2007Physics-Electromagnetism
AIPMT PRELIMS 2007 Physics Mass Spectrometer MCQ Question
Type: MCQ-numerical-Medium-Class 12
In a mass spectrometer used for measuring the masses of ions, the ions are initially accelerated by an electric potential V and then made to describe semicircular path of radius R using a magnetic field B. If V and B are kept constant, the ratio (charge on the ion / mass of the ion) will be proportional to
A
1/R²
B
R²
C
R
D
1/R
Correct Answer
Option A
Detailed Explanation
The radius of the path in a mass spectrometer is given by R = mv/qB. Solving for q/m gives q/m ∝ 1/R².
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