“How do we know the direction of magnetic field around the current carrying conductor?” Asked Nikhil Incoming search terms:direction of magnetic field around a current carrying conductorDIRECTION OF MAGNETIC FIELD IN CURRENT CARRYING CONDUCTORmagne...
I have a question based on current as we all know that current flows due to the movement of electrons in substance. Now suppose a conductor having electrons randomly in motion so we study that current flow due to flow of electrons in a substance so this have to produce electric current. Then why a … Continue reading Electric Current and Conductor
Pratham asked: The resistances of 2 bulbs are in the ratio 1:2.if they are joined in series,find the ratio of the energy consumed by the 2 bulbs? Answer: When connected in series, the same current flows through each of the resistors. Therefore, the energy dissipated is directly proportional to their resistances. That is, the … Continue reading A Question from Current Electricity
Some important points to remember The resistance of a conductor does not change when the current through it is changed or the voltage across it is changed. When current is changed, the voltage across it is also changed so that the ratio V/I = R The value of resistance changes if the dimensions (length or … Continue reading Electricity – Class X CBSE
At room temperature (27 oC) resistance of a heating element is 100 ohm. What is the temperature of the element if the resistance is found to be 117 ohm. Given, temperature coeff. of resistance of the material is 1.70 x 10 -14 oC-1 The ends of a resistance are connected to 19 cells in series, … Continue reading Numerical Problems for Practice – Current electricity
In a potentiometer arrangement a cell of emf 1.25 V gives a balance point at 35 cm length of the wire. If the cell is replaced by another cell, the balance point shifts to 63 cm. What is the emf of the second cell? E1= 1.25 V l1 = 35 cm l2 = 63 cm … Continue reading Current electricity – Numerical problems
Pawan Asked "What is meant by potential difference?" Answer: "Potential Difference between two points is the difference in Potential between the two points and is equal to the work done per unit charge ion carrying a positive test charge from one point to another against the electric field and without any acceleration"