What is self inductance and mutual inductance ?
Explanation Self Inductance Self-induction means the coils induce the emf themselves. There is a change in the magnetic flux through that coil and because of this, the current will be…
What is torque ?
Explanation Torque is a measure of the force that can cause an object to rotate about an axis. Torque is a vector quantity. The direction of the torque vector depends…
What will be effect on weight of our body , if we move to the moon ?
Explanation First of all , we need to understand difference between mass and weight of a body it is not same thing . Mass is defined as the amount of…
Why do we place handles at maximum possible distance from the hinges in a door ?
Explanation we place handles at maximum possible distance from the hinges in a door because torque is rotating effect of force. It is calculated by formula : τ = R…
What is mirage ? How it is formed ?
Explanation Mirage is an optical phenomenon that generates an illusion of a water layer at short distances, on long straight roads. Mirage is mostly experienced on sunny days when the…
What is centre of mass ?
Explanation It is a balancing point of a body . It is a point where whole mass of a body is supposed to be concentrated. Centre of mass always lie…
Two bodies of masses 2kg & 6kg are separated by a certain distance. If the body of mass 6kg is moved 2m towards right, then by how much distance the body of 2kg mass must be moved so that the centre of mass of the final system remains same as that of the initial system?
As it is given that both mass are separated by a certain distance , then centre of mass would be lie in between line joining. as we know , Rcm…
A transparent cube of side 210 mm contains a small air bubble. Its apparent distance, when viewed from one face of the cube is 100 mm , and when viewed through opposite face is 40 mm. What is the actual distance of the bubble from the second face and what is the refractive index of the material of the cube ?
Let the bubble be at a distance x from face I , then distance from face II be (210 - x). As μ = real depth /apparent depth Therefore, for…
Why PN Junction diode do not work in reverse bias ?
P-N junction diode P-N junction is an interface or a boundary between two semiconductor material types, namely the p-type and the n-type, inside a semiconductor. The method of applying voltages…
Why does a plastic comb rubbed with dry hair attract bits of paper while iron scale does not ?
Explanation A plastic scale after being rubbed against dry hair attracts bits of paper as it acquires a negative charge due to its high work function than hair. It gets…