13. Two igh wires re hung vertical, With electricl curent in both wires directed

Question

13. Two igh wires re hung vertical, With electricl curent in both wires directed upw ards A) the wires will experience a force of attraction C) the force on the right hand wire will cancel the force on the left hand wire D) both wires will experience a torque until they are at right angles to each other E) none of the above 8) the wires will experience a force of repulsion A wire moves with a velocity v through a magnetic field and experiences an induced charge separation as shown left side negative, right side positivel What is the direction of the magnetic field? 14. A) into the page C) towards the right E) towards the top of the page B) towards the bottom of the page D) out of the page 15. A positively charged particle moves to the right. It enters a region of space in which there is an electric field directed up the plane of the paper as shown. In which direction does the magnetic field have to point in this region so that the particle maintains a constant velocity? B) out of the plane of the page D) to the left C) to the right E) up the plane of the page A compass is placed near a coil of wire. A conventional electrical current is then run through the coil from left to right as shown. This will cause the North pole of the compass to: A) point toward the left B) point toward the right C) point toward the bottom of the paper D) not move since the magnetic field of the coil is into the paper E) not move since the magnetic field of the coil is out of the paper 16. «D Two parallel wires are carrying different electric current in the same direction as shown. How does the magnitude of the force of A from 8 compare to the force of B from A 17. 41 18. A positively charged particle of mass M is at rest on a table. A non-zero electric field E is directed into the plane of the table. A non-zero magnetic field B is directed out of the plane of the table. What is true about the magnitude of the electric force on the particle FE compared to the magnetic force on the particle Fa? D) It cannot be determined without knowing the exact value of the charge of the particle E) The relative sizes of the electric and magnetic fields are needed to answer this question 19. A positive electric charge of negligible weight is released from rest between the poles of a horseshoe magnet as shown. What would be the direction of the acceleration of the charge caused by the magnetic field? A) towards the north pole B) towards the south pole C) upwards D) downwards E) none of the above 3-

Explanation / Answer

13.

A) Parallel current wires with same direction current attract.

14.

A) Into the page

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