The unit of electric current is the Ampere.
1 Ampere of current means that if you set up your chair and
stare at the electrons flowing past one point in the circuit, you'll
see 1 coulomb of charge passing that point every second.
How will you recognize 1 coulomb of charge ?
Well, every electron carries the same amount of charge, and
we know how much that is. (Read about the Millikan oil-drop
experiment in 1909.) So we know how many electrons it takes
to carry 1 coulomb of charge past the point you're watching.
All you have to do is count the electrons as they zip past.
Every time you count 6,241,509,343,000,000,000 electrons,
you can tick off 1 coulomb of total charge that they're carrying.
If you reach that count every second, you know the current
passing that point is 1 Ampere.
Answer:
Note: Check the attached image for a clearer question
From the attached image, the answers are 2,3,6,7
Explanation:
Maximum power occurs at resonance, i.e. 
, not when impedance is greater than resistance
Resonance occurs when the Inductive reactance equals the capacitive reactance, i.e. , not 
and when, 
Therefore, option B is correct
Since the formula for impedance is 
, at resonance, Z = R i.e. the impedance is minimum
At resonance, there is maximum power and minimum impedance
Thew Quality Factor, 
The impedance Z is always larger than the resistance R, note that it is not stated that this condition is at Resonance, that makes it correct.
near the north and south poles of the magnet
Explanation:
Magnetic fields around a permanent magnet is strongest near the north and south poles of the magnet.
Magnetic fields are the region of space around a magnet where magnetic effects are felt.
- This is as a result of a force field that surrounds the magnet.
- Magnetic fields are strongest within the magnet.
- Also, externally, they are strongest at the poles of a magnet.
- Around the poles, magnetic lines of force leaves and enters a magnet.
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Answer:
intensity because square of the amplitude is proportional to the intensity of the wave
Explanation:
