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A coil is connected to a voltmeter. A bar magnet, initially held above the coil, is left to fall into the coil. Explain why the voltmeter shows a reading. How will the reading of the voltmeter be affected if the magnet is dropped from a greater height?

As the bar magnet enters and exits the coil, there is a change in magnetic flux linkage through the coil. According to Faraday's law, an EMF is induced across the coil that is proportional to the rate of cha...
AA
Answered by Andrea A. • Physics tutor
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Explain, with the aid of annotated diagrams, the various stages and processes involved in the formation of a stack.

Hydraulic action and constant pounding of the waves against the rock causes faults and weaknesses in the cliff. Overtime, faults are enlarged as the pressurised air cracks the rocks and forms a wave- cut not...
HW
Answered by Hannah W. • Geography tutor
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Simplify 5p + 2q – 3p – 3q

Firstly, look at the number in front of the letter 'p'. This is 5p and -3p. By ignoring the 'p', as they both have it, do 5-3 which is 2 and so that part of the answer will be 2p. Then look at the letter 'q'...
RA
Answered by Radhika A. • Maths tutor
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Matthew gets £100 for his 16th birthday and chooses to invest the money into a bank with a 2% annual interest rate. By which birthday will Matthew have more than £150 in his account?

This a geometric sequence with first term 'a' as 100 and common ratio 'r' of 1.02. 100 x 1.02 n > 150 1.02 n > 150/100 =1.02 n > 1.5 log 10 (1.02 n ) > log 10 (1.5) Using power rule, n[log 10 (1....
Answered by • Maths tutor
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Please can you help me to understand the concept of price elasticity of demand (PED)?

PED is a measure of the responsiveness of demand following a change in the price of a good or service e.g. if the price of good X rose by 20%, PED would measure the extent to which the demand for good X chan...
TP
Answered by Tara P. • Economics tutor
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