A student is trying to determine the strength and direction of the (uniform) mag

Question

A student is trying to determine the strength and direction of the (uniform) magnetic field between the poles of a certain permanent magnet to use for future experiments.

a.) The student hangs a wire from a sensitive balance and measures its mass to be .720 g. Placing it between the 11.2 cm long square poles of the magnet, the student runs a current throught the wire. When the current reaches a magnitude of .277 A, running from right to left, the balance no longer measures its mass. Find the magnitude and direction of the magnetic field. Assume that the magnetic field is either into or out of the page with no components in the plane of the page.

b.) A stream of identical charged particles having velocity 4.41 * 10^5 m/s enter into the magnetic field in part (a) with the wire removed. They travel the circular arc shown in the second figure. Determine the charge to mass ratio of the particles and their polarity. You may assume that the magnetic field is zero outside the poles of the magnet.

Explanation / Answer

I*L*B = m*g

B = m*g / L*I = 0.720 * 9.81 / (0.112* 0.277 ) = 227.668 T out of the page

b)

r =mv/qb

q / m = v /rB = 4.41 * 10^5 / 0.112 * 227.668 = 17294.92   

and it is negetive charge if it is entering from left top edge

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