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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 objec...
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Answered by Mabast H. • Physics tutor
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Explain how the human eye has both high sensitivity and high acuity.

The human eye has high sensitivity because many rods connect to a singular neurone, so many weak generator potentials combine to reach the threshold and trigger an action potential. The human eye has a high ...
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Answered by Anna M. • Biology tutor
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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 the negative rate of change of magnetic flux enclosed in the circ...
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Answered by Mabast H. • Physics tutor
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Draw the graph y=4x+2

From the format of the equation, we know this graph is a straight line because it follows the form, y=mx+c. The coefficent of x (the number before x) describes the gradient of the straight line or m. This me...
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Answered by Della S. • Maths tutor
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Draw y=x^2+5

Draw y=x^2+5. Draw the axes. Y to the sky (Y axis is vertical) and X across (X axis is horizontal). Then breakdown the equation. Firstly what power is the x to? x^2 means that the graph will have a U shape. ...
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Answered by Dona S. • Maths tutor
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