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A horizontal metal bar oriented east-west drops straight down in a location where the earth's magnetic field is due north. as a result, an emf develops between the ends. which end is positively charged?

Respuesta :

Metal bar is aligned along East- West direction and it is dropped vertically down

So its velocity is along -Z direction,

Now the Earth's magnetic field is towards north so its towards +Y direction

now we have formula for force on a moving charge

[tex]F = q(v X B)[/tex]

v = - z direction

B = + y direction

now by the above formula

[tex]F = q(v(-k) X B(j))[/tex]

[tex]F = qvB (i)[/tex]

So force is towards East

so all positive charge is towards East end


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