Electrostatics physics question, by checking my answers

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SUMMARY

This discussion focuses on solving various electrostatics and circuit problems, specifically involving current, resistance, and voltage. The user calculated the charge flow from a .20mA current over 20 minutes as 2.4 x 10^-2 Coulombs. They also determined the resistance change when the radius of a wire is doubled to be 0.6 x 10^2 Ohms, and identified the resistance of each of three parallel resistors as 4 Ohms. Additionally, they calculated the unknown resistor in a parallel circuit with a total resistance of 6 Ohms to be 15 Ohms, while seeking help on calculating current in two different circuit configurations involving 6V batteries and 10 Ohm resistors.

PREREQUISITES
  • Understanding of Ohm's Law and basic circuit theory
  • Knowledge of parallel and series resistor combinations
  • Familiarity with the concept of current measured in milliamperes (mA)
  • Basic principles of electrostatics, including charge and voltage
NEXT STEPS
  • Study the calculation of charge flow using the formula Q = I × t
  • Learn about the effects of changing wire radius on resistance using the formula R = ρ(L/A)
  • Explore the analysis of series and parallel circuits to calculate total resistance and current
  • Investigate Kirchhoff's laws for more complex circuit analysis
USEFUL FOR

Students studying physics, particularly those focusing on electrostatics and circuit theory, as well as educators looking for examples of circuit calculations and resistance concepts.

Roro312
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Homework Statement



1. suppose that your calculator requires .20mA to operate and will be on for 20min while you solve this problem. What quantity of charge will flow during this time? I got 2.4x10^ -2

2. If the potential difference across the nerve of a frog is 85mV and its resistance is 2.5 x10^ 2 ohms. What change in resistance would result if the radius of a wire were doubled?
I got 0.6 x 10^ 2 Ohms.

3. A parallel combination of three identical resistors has a total resistance of 12 ohms. What is the resistance of each resistor? i got 4 ohms


4. 2 resistors are connected in parallel. The total resistance of the combination is known to be 6 ohms. If one of the resistors is 10 ohms, what is the value of the other? I got 15 ohms

5. A person connects a 6.0 v battery in series with a 10 ohms resistor and two 10 ohms resistors connected in parallel. In a second circuit, the person connects an identical 6 V battery to two 10 ohms resistor connected in series. Calculate the current in the first and second circuits?
I don't know how to do this one at all



Homework Equations





The Attempt at a Solution

 
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Roro312 said:

Homework Statement



1. suppose that your calculator requires .20mA to operate and will be on for 20min while you solve this problem. What quantity of charge will flow during this time? I got 2.4x10^ -2

2. If the potential difference across the nerve of a frog is 85mV and its resistance is 2.5 x10^ 2 ohms. What change in resistance would result if the radius of a wire were doubled?
I got 0.6 x 10^ 2 Ohms.

3. A parallel combination of three identical resistors has a total resistance of 12 ohms. What is the resistance of each resistor? i got 4 ohms


4. 2 resistors are connected in parallel. The total resistance of the combination is known to be 6 ohms. If one of the resistors is 10 ohms, what is the value of the other? I got 15 ohms

5. A person connects a 6.0 v battery in series with a 10 ohms resistor and two 10 ohms resistors connected in parallel. In a second circuit, the person connects an identical 6 V battery to two 10 ohms resistor connected in series. Calculate the current in the first and second circuits?
I don't know how to do this one at all



Homework Equations





The Attempt at a Solution


Can you show the equations you used for these? And your math?
 

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