Physics

Physics

Problem

I1>I2>IBI_1 > I_2 > I_B I1>IB>I2I_1 > I_B > I_2 I2>I1>IBI_2 > I_1 > I_B I2>IB>I1I_2 > I_B > I_1 IB>I1>I2I_B > I_1 > I_2 IB>I2>I1I_B > I_2 > I_1 I1=I2=IBI_1 = I_2 = I_B a. State, in terms of their structure, why metals are good conductors of electricity. b. Extended tier only: A cylindrical metal wire W1W_1, of length LL and cross-sectional area AA, has a resistance of 16 Ω16\ \Omega. A second cylindrical wire W2W_2, of length L2\frac{L}{2} and cross-sectional area 2A2A, is made from the same metal. Determine the resistance of W2W_2. c. Extended tier only: A cylindrical metal wire W1W_1, of length LL and cross-sectional area AA, has a resistance of 16 Ω16\ \Omega. A second cylindrical wire W2W_2, of length L2\frac{L}{2} and cross-sectional area 2A2A, is made from the same metal. Determine the effective resistance of W1W_1 and W2W_2 when connected in parallel. d. Extended tier only: The parallel pair of resistors in (b)(ii) is connected to a battery that is made from three cells in series, each of electromotive force (e.m.f.) EE. There is a current in each resistor. State the e.m.f. of the battery. e. Extended tier only: The current in the battery is IBI_B, the current in W1W_1 is I1I_1 and the current in W2W_2 is I2I_2. Place a tick in one box to indicate how these three currents are related. a.

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