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Physics
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What is the current in a circuit?

The current is the rate of flow of charge. It is a measure of how many electrons pass a point over a certain amount of time. We measure current using an ammeter which gives current in Amps. Current is usu...

EJ
Answered by Emma J. Physics tutor
3548 Views

The energy of a photon is 1.5MeV. Calculate the frequency associated with this photon energy and state an appropriate unit in your answer.

E=1.5MeV = (1.5x10^6)(1.6x10^-19)J = 2.4x10^-13J E=hf, f=E/h = (2.4x10^-13)/(6.63x10^-34)=3.6x10^20Hz

TD
5297 Views

A metal detector consists of a battery providing an alternating current to a transmitter coil and a receiver coil connected to a loudspeaker. Using Faraday's Law of Induction explain how a metal detector works. (5 marks)

The alternating current flows through the transmitted coil and produces a magnetic field around the coil. (1 mark) When the detector passes over a magnetic object, the magnetic field passes through the ob...

MH
Answered by Mabast H. Physics tutor
3859 Views

State Faraday's Law of electromagnetic induction, both qualitatively and quantitatively. How is Lenz's Law included in this? (4 marks)

emf= (-) d(magnetic-flux)/dt (1 mark)                                                                Faradays law of induction states that the electromotive force induced in any closed circuit is equal to...

MH
Answered by Mabast H. Physics tutor
10162 Views

Is momentum a vector quantity? Why?

Yes - Momentum is a vector quantity. A vector quantity possesses both a magnitude and direction. A scalar quantity possesses only a magnitude and no direction. Mass is an example of a scalar quantity (mas...

HL
Answered by Harry L. Physics tutor
45358 Views

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