6. An electric current flows through a horizontal wire as option best represents

Question

6. An electric current flows through a horizontal wire as option best represents the direction of the magnetic field at shown. Which point P A) into the page Cl to the right of the page oj toward the top of the page E) toward the bottom of the page B) out of the page 7. Two bar magnets are to be cut in half along the dotted lines shown. None of the pieces are rotated. After the cut: A) None of the halves will attract any other B) The two halves of each magnet will attract each other C) The two halves of each magnet will repel each other D) The E) The two halves of the top magnet will attract, the two halves of the bottom magnet will repel two halves of the top magnet will repel, the two halves of the bottom magnet will attract 8. An ion with charge q, mass m, and speed V enters a magnetic field 8 and is deflected into a path with a radius of curvature R. If a second ion has speed 2V, while m, q and B are unchanged, what will be the radius of the second ion's path? 9. A wire moves through a magnetic field directed into the page. The wire Which way is the wire moving? x x xxXx X A) to the right B) to the left C) out of the page D) toward the top of the page E) toward the bottom of the page 10. A charged particle with constant velocity enters a uniform magnetic field whose direction is parallel to the particle's velocity. The particle will A) speed up D) follow a parabolic arc B) slow down E) follow a circular arc C) experience no change in velocity The diagram to the right depicts iron filings sprinkled around three permanent magnets. Pole R is the same pole as 11. A) Tand Y C) X and Y B) Tand Z D) X and Z E) S, T, and z If conventional electric current flows from left to right in a wire as shown, what is the direction of the magnetic field at point P? 12. A) towards the top of the paper B) towards the bottom of the paper C) into the paper D) out of the paper E) to the right

Explanation / Answer

6. The current is rightwards, so the field at P is (A) into the page.

7. (E) The two halves of the top magnet will attract, the two halves of the bottom magnet will repel.

8. R= mv/qB ; So, R1= m*2v/qB= 2*mv/qB; (B) R1= 2R

9. The wire is moving (E)toward the bottom of the page, so that the +ve charges feel righwards and -ve charges leftwards force.

10. Velocity and field are parallel, so their cross product is zero and so, force is zero. So, the particle will (C) experience no change in velocity.

11. R is the same poles as (B) T and Z

12. (C) into the paper

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