To measure the specific charge(e/m) of an electron by using J. J. Thomson’s Method.

Objective:

To measure the specific charge(e/m) of an electron by using J. J. Thomson’s Method.

Theory:

Experimental Result:

  • Observation table for diameter of the rings Vs accelerating voltage

Supplied data:-

Helmholtz coils of radii = 14 cm.

Number of turns = 160 on each coil (n)

Permeability of free space = 4π ×10-7N/A2

e/m = 1.77 x 10 11 coul/kg.

Calculations:-

Draw the Diameter2 Vs accelerating voltage graph and calculate e/m  from the slope using equation (7). 

Percentage error:

Conclusion:

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