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Capacitance, voltage and Potential difference
the capacity of parallel plate condenser is 5 micro Faraday. When a glass plate is placed between the plates of the conductor its potential become 1/8th of the original value. The value of dielectric constant will be
(A)1.6
(B)5
(C)8
(D)40
Answer:
The charge remains same
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Potential Difference
Pawan Asked
“What is meant by potential difference?”
Answer:
“Potential Difference between two points is the difference in Potential between the two points and is equal to the work done per unit charge ion carrying a positive test charge from one point to another against the electric field and without any acceleration”
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de Broglie Wavelength
Alpha particle and a proton are accelerated from rest by the same potential. Find the ratio of their de- broglie wavelength
(Asked by Amritha)
Answer:
Charge of alpha particle = 2e
Mass of alpha particle = 4 u
Charge of proton = e
mass of proton = u
The energy acquired by proton when accelerated through a pd of V,
E=eV
The momentum acquired by proton=
The de Broglie wavelength is given by
Therefore, de Broglie wavelength of Proton,
Similarly,
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Differences Between EMF and Potential Difference
What is main relationship between EMF and potiential difference?
Answer: The question is already answered at http://askphysics.com/difference-between-emf-and-pd/
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Difference between emf and pd
ananthesh asked:
“can you please explain about emf and PD of a cell?”
Answer:
EMF stands for electromotive force.
EMF of a cell is equal to the potential difference between the two terminals of a cell when no current is drawn from it.
Pd (potential difference) between any two points on a circuit is defined as the work done per unit charge in carrying a positive test charge from one point to the other. With reference to a cell, the potential difference between the terminals of a cell when a current is drawn from it is called terminal voltage.
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Physics Masters
Vivek Sawhney
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