2. A cell has a terminal voltage of 50.0 V for a current of 10.0 A, and 54 V for a current of 6.0 A. Find the electromotive force and internal resistance of the cell. 3. A compact fluorescent lamp (CFL) uses less energy than its equivalent incandescent bulb. How much will a person save if he/she uses a 20 W CFL instead of a 100 W incandescent lamp for 6 hours in 30 days? Electricity is prized at Php 8.17/ kWh?

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
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Problem Solving. Solve the following problems. Show your solution using the GUESS method of problem solving.

1. The electric field of the material between two coaxial cables of radius 0.525 cm and 0.675 cm is
2.85 V-m
given as E =
r3
If the conductivity of the material is 5 x 1010 S/m, what is the current density in
the material?
2. A cell has a terminal voltage of 50.0 V for a current of 10.0 A, and 54 V for a current of 6.0 A. Find
the electromotive force and internal resistance of the cell.
3. A compact fluorescent lamp (CFL) uses less energy than its equivalent incandescent bulb. How
much will a person save if he/she uses a 20 W CFL instead of a 100 W incandescent lamp for 6
hours in 30 days? Electricity is prized at Php 8.17/ kWh?
Transcribed Image Text:1. The electric field of the material between two coaxial cables of radius 0.525 cm and 0.675 cm is 2.85 V-m given as E = r3 If the conductivity of the material is 5 x 1010 S/m, what is the current density in the material? 2. A cell has a terminal voltage of 50.0 V for a current of 10.0 A, and 54 V for a current of 6.0 A. Find the electromotive force and internal resistance of the cell. 3. A compact fluorescent lamp (CFL) uses less energy than its equivalent incandescent bulb. How much will a person save if he/she uses a 20 W CFL instead of a 100 W incandescent lamp for 6 hours in 30 days? Electricity is prized at Php 8.17/ kWh?
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