A square loop of wire carries a current I. Current is flowing in a counterclockw

Question

A square loop of wire carries a current I. Current is flowing in a counterclockwise direction as shown, 1) What is the direction of the magnetic field at A? Into the page Out of the page The field is zero 2) What is the direction of the magnetic field at B? Into the page out of the page The field is zero The next two questions are about the following situation: Three particles of the same charge and the same speed of v, but with three different masses, enter a region of constant magnetic field into the page (B- 0.5 T) B-05T

Explanation / Answer

(1)

From the Fleming left hand rule, the direction of magnetic field at point A is out of the page

(2)

the direction of magnetic field at point B is into the page

(3)

magnetic force is equal to centeripetal force

B qv = mv^2/r

r= mv/ qB

r is proportional to mass

greater mass has greater radius

so particle 3 has larger mass

(4)

toward righ side

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