What is the value of workdone by Lorentz force​

When a wire is placed in a magnetic field and current flows in that wire work is done on the wire and be calculated:

W = Fd

F = IL x B

W = ( IL x B )x d

v^2=2gh

so velocities will be in the ratio 9: 25

displacement method is used for measuring the volume of irregular solid

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displacement is usually the method that is used to measure the volume of an irregularly shaped object. the object is simply submerged in a liquid and the volume of liquid that is displaced is measured. as an example imagine a 100 ml graduated cylinder with 50 ml of water in it (half filled).