Electrostatic induction – Where does the charge go on earthing?
Rajkumar asks:”in electrostatic induction in step 3 when earthed wire is removed then where the free negative charge go.does they go to earth then what happen to them.” Waiting for responses from...
View ArticleCollection of Problems received from Class 12 Physics
These problems were posted by Geena. Hope that we will be able to post the answers to these questions soon; each in a separate post. By the time visitors can attempt to post their answers as comments...
View ArticleWhy direct currents aren’t used in Home circuits?
How can an alternating current change its direction while moving in a wire or any conductor? Why direct currents aren’t used in Home circuits? RAHUL ASKED Answer: Alternating current is produced by...
View ArticleA few selected questions fro CBSE Class 10 Physics Summative Assessment 1
Dear students, If you are preparing for the CBSE Summative Assessment I for Class X, Give the following questions a try. If you are not able to solve any of it, please post your doubts as comments to...
View ArticleWire Gauge and Resistance problem
I am using 18 gauge nicrome wire having ohm of 17.3 , 220 volt. I want to use 10 gauge wire how to decide the length? Padmanava asked Answer: 18 gauge corresponds to a diameter of 1.22 mm Therefore...
View ArticleIs it true that a person touching a high power line get struck with the line?
Amritha Asked: Is it true that a person touching a high power line get struck with the line? Answer: Ya, This is due to the strong contraction of the muscles making the person not at all able to...
View ArticleForce on Current carrying conductor
“Thin and flexible wire is kept on a table in the form of a rectangle and a strong current is send through it. How will be the shape of the wire as a result?” Asks Riya Answer: The parallel sides are...
View ArticleWhy we specifically note resistance in a circuit while all part of a wire...
Why we specifically note resistance in a circuit while all part of a wire have some resistance..??? Answer: The resistance of the rest of the circuit compared to the resistance of the resistor is...
View ArticleChange in resistance of a wire on stretching
A WIRE OF LENGTH L AND AREA OF CROSS SECTION A HAS A RESISTANCE R. IF THE WIRE IS STRACHED TO TWICE OF ITS LENGTH WHILE A REMAINS SAME , WHAT IS THE NEW RESISTANCE???? Answer: We know that R = ρl/A...
View ArticleCalculating g on Moon
An astronaut on the moon wishes to calculate the local g in the area. He sets up a wire with a mass of 1.7 grams and hanging from it an object with mass 4.98 kg. He sends some kind of pulse down the...
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