A bar of silver (black bar at the left of the drawing) is moving from left to ri

Question

A bar of silver (black bar at the left of the drawing) is moving from left to right across the page. If there is a magnetic field directed into the page, which side of the bar has a net Negative charge? A) from B) back C) top D) bottom E) right F) left Relative to the page what is the direction of the farer on charged particle moving down the page through a uniform magnetic field which is directed left to right across the page? A) right B) left C) up D) down E) into the page F) out of the page The magnetic flux through an area is given by Phi = BAcos theta, where theta is the angle between which quantities? A) The plane the loop lies in and the B field. B) The normal to the plane the loop lies in and the B field C) None of these.

Explanation / Answer

force on charge F = q*(v xB)

for electron charge q = -e

top

option(D)

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Lenz law

OPTION( D)

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velocity v = -vy j (down)

magnetic field B = Bx i (right)

charge q = e

magnetic force F = q*(vxB)

F = e*(-vy j x Bx i )

F = e*vz*Bx (k)   out of page

OPTION (F)

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OPTION (B)

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