Why does moving part of a moving coil galvanometer come to rest almost instantaneously ?
Question : Why does moving part of a moving coil galvanometer come to rest almost instantaneously ? Ans. Due to electromagnetic damping…
If the polar ice caps melt & spread uniformly , how will the length of the day be affected ?
Question: If the polar ice caps melt & spread uniformly , how will the length of the day be affected…
Why does Microwave oven heats up the food items containing water molecules most efficiently ?
Question: Why does Microwave oven heats up the food items containing water molecules most efficiently ? Ans. Microwave oven heats up…
In a magnetic field , a charged particle always moves in a circular path . Why ?
Question: In a magnetic field , a charged particle always moves in a circular path . Why ? Ans: In a magnetic…
It is sometimes difficult to recognize a voice over the telephone . why ?
Question : It is sometimes difficult to recognize a voice over the telephone . why ? Ans: The telephone changes the pattern…
Transverse waves are possible in solids but not in fluids .Why ?
Question: Transverse waves are possible in solids but not in fluids .Why ? Ans: Transverse waves require ‘rigidity’ in the medium…
Why does Cream separate from the milk when milk is churned ?
Ans: The particle whose density is less than that of liquid are driven towards the axis of rotation and those…
What is the Electric charge ?
Ans: Electric charge, like mass, is one of the fundamental attributes of the particle of which the matter is made.…
Why do bird fly off a high tension wire when the current is switch on ?
Ans. As they experience a strong force of repulsion due to induced current in their body .
In a transformer , there is no transfer of charge from primary to secondary . How then is the power transferred ?
Ans. Power is transferred through induced emf .
Why is the core of a transformer laminated ?
Ans. The core is laminated to avoid loss of energy in the form of heat energy produced by ‘ eddy…
A magnet is dropped down a long vertical copper tube . What will happen to its ultimate motion ?
Ans. As the magnet falls with greater and greater velocity , stronger and stronger current is induced in the copper…