Case 2 Deflection at B  
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Here is Canvas object wihch demonstrate the problem.
Although the concentrated load P is applied at B (rather than the tip C) for our configuration, observe that this deflection equation gives the beam deflection at the location of the concentrated force.

Begin the analysis of case 2 by looking in beam tables and finding the case of a cantilever beam with a concentrated load P acting at the tip of the cantilever. The equation for the beam deflection at the tip is given as:

table

Since the beam deflection at B is desired here, the general equation provides the necessary information. Therefore:

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Cantilever beam – concentrated load at tip