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6.Electrified.What must be the electric field so that the particle continues to move in astraight path?A.+(15N/C)ˆı-(20N/C) ˆB.-(15N/C)ˆı+ (20N/C) ˆB – 3
Second Long ExamMidyear, AY 2015–2016Physics 72C.-(20N/C)ˆı-(15N/C) ˆD.+(20N/C)ˆı+ (15N/C) ˆSolution:~Fnet= 07.Momen tu luong cuc.Three loops carrying the same current in the counter-clockwisedirection are immersed in different magnetic fields, as shown. Which loop is in an unstableequilibrium?Solution:hehe8.Magneto in a box.Magneto is inside a box. He triesto get out of the box by emitting a magnetic field. Themagnetic flux through the top side of the flux is650 V·s.What is the net magnetic flux through the other 5 sidesof the box?9.
So what’s the point in all of this?A point particle with a negative charge,-Q, move inanxy-plane with speedv. At one moment, the particle is found at coordinate(a,0)movingto the+y-direction. What is the magnetic field at the origin at this moment?B – 4
Second Long ExamMidyear, AY 2015–2016Physics 7210.Patungan.Two very long, straight, insulated wires areoriented at right angles. The wires carry currents of equalmagnitudeIin the directions shown.What is the netmagnetic field at pointP?A. zeroB.μ0IπaˆkC.μ0I2πa(ˆı+ ˆ)D.-μ0I2πa(ˆı+ ˆ)Solution:heheB – 5
Second Long ExamMidyear, AY 2015–2016Physics 7211.Infinitesimal B.A wire carrying a currentIis bent at aright angle. Consider the two segments labeleddxanddyin the figure. What is the magnetic field due to thesesegments at pointP?