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IB Physics--B.5-Electricity and Magnetism-Paper 2-Qc#5 Kirchhoff's law
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a. Two cells of negligible internal resistance are connected in a circuit.The top cell has electromotive force (emf) 12V. The emf of the lower cell is
unknown. The ideal ammeter reads zero current.
Calculate the emf E of the lower cell.
b. The diagram shows charge carriers moving with speed v in a metallic
conductor of width L. The conductor is exposed to a uniform magnetic
field B that is directed into the page.
(i) Show that the potential difference V that is established across the conductor is
given by V=vBL.
(ii) On the diagram, label the part of the conductor where negative charge
accumulates.
Topic 5 Electricity and Magnetism
unknown. The ideal ammeter reads zero current.
Calculate the emf E of the lower cell.
b. The diagram shows charge carriers moving with speed v in a metallic
conductor of width L. The conductor is exposed to a uniform magnetic
field B that is directed into the page.
(i) Show that the potential difference V that is established across the conductor is
given by V=vBL.
(ii) On the diagram, label the part of the conductor where negative charge
accumulates.
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