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Old Jun 10th 2009, 01:11 AM   #1
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General Physics Numerial & Question

Please solve and answer these questions I will be thankful to you.

Q1
Define Current. Differentiate between direct and indirect current.

Q2
If Q1 is a 40μC positive charge , Q2 is 100μC negative charge and r = 50mm, then
Find the force of attraction.

Q3
A dielectric has a positive charge of 12.5 x 1018 protons. What is the charge in coulombs?

Q4
To move a 0.33C positive charge from X to Y if Vxv = -20V
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Old Jun 10th 2009, 03:13 AM   #2
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These are simple questions based directly on the fundamentals and must be present in your prescribed books. Please attempt them and post your attempts and difficulties.
The last question looks incomplete.
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Old Jun 10th 2009, 04:26 AM   #3
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All right but please answer the Q1 I have found direct current detail, but what is "indirect current" confusing me because there are additional current like "Alternate current" and "conventional current" please answer it.
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Old Jun 10th 2009, 04:03 PM   #4
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Originally Posted by gameuser View Post
All right but please answer the Q1 I have found direct current detail, but what is "indirect current" confusing me because there are additional current like "Alternate current" and "conventional current" please answer it.
I would presume, as did physicsquest that your text book likely has all the answers you need.

1. Try your glossary. I was unable to Google "indirect current."

2. What is Coulomb's Law?

3. This is a simple unit conversion problem. What is the charge on a proton?

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Old Jun 11th 2009, 01:45 AM   #5
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Only one explanation for the term "indirect current" comes to mind though i don't know if it is what is expected.

In a direct current, the direction of current flow is the same, while in an alternating current, the direction of current reverses (i.e. the polarity reverses). However if we use a half wave rectifier we have a current which varies periodically, but does not change direction.

Maybe this is what is meant by "indierct current"!
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