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 Jun 10th 2009, 01:11 AM #1 Junior Member   Join Date: Jun 2009 Posts: 2 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
 Jun 10th 2009, 03:13 AM #2 Physics Team   Join Date: Feb 2009 Posts: 1,425 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.
 Jun 10th 2009, 04:26 AM #3 Junior Member   Join Date: Jun 2009 Posts: 2 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.
Jun 10th 2009, 04:03 PM   #4

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 Originally Posted by gameuser 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.

2. What is Coulomb's Law?

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

-Dan
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 Jun 11th 2009, 01:45 AM #5 Physics Team   Join Date: Feb 2009 Posts: 1,425 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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