Coulomb’s Law force on a third charge MSTLTT Math 库仑定律力量在三分之一电荷mstltt数学.pptVIP

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Coulomb’s Law force on a third charge MSTLTT Math 库仑定律力量在三分之一电荷mstltt数学.ppt

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Coulomb’s Law force on a third charge MSTLTT Math 库仑定律力量在三分之一电荷mstltt数学

PhysicsElectrostatics: Coulomb’s Law – Force on a Third Charge Science and Mathematics Education Research Group Supported by UBC Teaching and Learning Enhancement Fund 2012-2013 Department of Curriculum and Pedagogy FACULTY OF EDUCATION a place of mind Force on a Third Charge + – + Three charges with equal magnitude but different signs are arranged as shown. Q3 is the same distance away from Q1 and Q2. What is the direction of the net force on Q3, if any? Coulomb’s Law I Q3 +q -q +q Q1 Q2 A. No net force B. Fnet C. Fnet D. Fnet E. Fnet Solution Answer: B Justification: Q1 and Q3 are both positive and will repel each other. Q1 and Q3 repel each other. This means that the force Q1 exerts on Q3 will point away from Q1. Q2 and Q3 have opposite charges, so they attract each other. Q2 and Q1 also attract each other. The force Q2 exerts on Q3 will point toward Q2. Adding the two forces gives Fnet. Q1 Q2 Q3 F1 on 3 F2 on 3 Fnet F1 on 3 F2 on 3 Fnet Two charges with the same magnitude but different signs are arranged as shown. Where should a positive charge be placed so that it experiences no net force? Coulomb’s Law II -q +q Q1 Q2 C. B. D. A. B. E. The charge will always experience a non-zero net force Solution Answer: E Justification: In order for the third charge to experience zero net force, the force it experiences due to both Q1 and Q2 must have equal magnitudes but point in opposite directions. Only points equidistant from Q1 and Q2 (points along the dashed vertical line) will experience a force with equal magnitude from Q1 and Q2. However, from last question we know that the net force will point to the right (towards the negative charge) for any positive charge placed along the vertical line equidistant from both charges . Therefore a charge will always experience a non-zero force. -q +q Q1 Q2 Coulomb’s Law III What is the direction of the force Q1 exerts on Q3? Q3 = -q Q1 = q Q2 = q All of the charges are the same distance apart. A B C D. E