Find the direction of the magnetic field acting on the positively charged partic

Question

Find the direction of the magnetic field acting on the positively charged particle moving in the various situations shown in the figure below if the direction of the magnetic force acting on it is as indicated.

Figure (a)     ---Select--- to the left to the right out of the page downward upward into the page Figure (b)     ---Select--- out of the page downward into the page to the right to the left upward Figure (c)     ---Select--- into the page to the right out of the page downward to the left upward

Explanation / Answer

as the magnetic field is given as

Fm = q*(V X B )

now, in figure(a) ,

magnetic field is INTO the page

for figure (b)

magnetic field is towards right

for figure (c)

magneitc field is downwards

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