by Sunday | Oct 7 | NABTEB QUESTIONS
Lenz’s law stats that: The induced current or (E.M.F.) always flows in such a direction as to oppose the change producing it.
by Sunday | Oct 7 | NABTEB QUESTIONS
Faraday’s Law of electromagnetic induction states that: i. Whenever there is a change in the magnetic flux linked by a circuit an e.m.f. is induced in the circuit ii. The magnitude of the induced e.m.f. or current is directly proportional to the time rate of change of...
by Sunday | Oct 7 | NABTEB QUESTIONS
Doppler’s effect can be defined as the change in the frequency of sound heard by an observer due to the relative motion of the source and the observer. An example is the roar of the motor of a racing car as it approaches and recedes from an observer at the race track....
by Sunday | Oct 7 | NABTEB QUESTIONS
An echo is the sound heard after the reflection of the sound waves from a plane solid surface (hard surface). How it can be used to measure the velocity of sound in air: Stand some distance directly in front of a vertical wall and clap two hinged wooden board sharply...
by Sunday | Oct 7 | NABTEB QUESTIONS
The difference between force and impulse: Force is that push or pull that will change or tend to change the state of rest or uniform motion of a body while impulse is the product of the (average) force acting on a body and the time duration which it acts. OR Force =...
by Sunday | Oct 7 | NABTEB QUESTIONS
Newtons 1st law: states that A body will continue in its state of rest or uniform motion along a straight line unless it is acted upon by an (external) impressed force. Newtons 2nd Law: states that the time rate of change of momentum of a body (mass x velocity) is...
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