resistance at each division. A Van de Graaff generator belt carries a charge of

Question

resistance at each division. A Van de Graaff generator belt carries a charge of 5 muC per square meter of surface. The belt is 0.5m wide and moves at 20 m/s. What current does it carry? if this charge is raised to a potential of 100 kV, what is the minimum power of the motor needed to drive the belt? A coil of nichrome wire is used as a heating element in a water boiler required to generate 8.0 g of steam per second from water at 100degree C. The wire has diameter of 1.80 mm and is connected to a 115-V power supply. Find the length of wire required. In the circuit shown in Figure 20-56, find the current in each resistor, the power supplied by each emf source, and the power dissipated in each resistor. Figure 20-56

Explanation / Answer

A belt carries a charge of = + 5.0 *10^-6 / m^2 width of the belt is w = 0.5 m belt moves with a velocity v = 20 m/s                                           current i = 20 m/s * 0.5 m * 5.0*10^-6 C / m^2                                               = 50 *10^-6 A b )   Minimum power of the motor is P = V * I                                                                 = 100*10^3 V * 50*10^-6 A                                                                 = 5.0 W

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