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Meghna Thapar 4 years, 11 months ago
The impedance of two capacitors in series is equal to the sum of the individual impedances of the two capacitors. Since the impedance is proportional to the inverse of the capacitance, the larger impedance of the series circuit means a smaller capacitance. Capacitors connected in series will have a lower total capacitance than any single one in the circuit. This series circuit offers a higher total voltage rating. The voltage drop across each capacitor adds up to the total applied voltage. ... This is why series capacitors are generally avoided in power circuits.
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Yogita Ingle 4 years, 11 months ago
Silk cloths: negatively charged
Glass rod: positively charged
When glass rod is rubbed with silk clothes, glass quickly loses electrons, and silk takes electrons out of the glass rod. So after rubbing, the glass rod becomes positively charged and the silk gets negative charge.
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Meghna Thapar 4 years, 11 months ago
The internal resistance of a cell is inversely proportional to the area of the electrodes dipped in electrolyte. The internal resistance of a cell is inversely proportional to the temperature of electrolytes. The internal resistance of a cell is inversely proportional to the concentration of the electrolyte. The electrolyte concentration affects the critical voltage and the critical current by the change in the electrical conductivity, resulting in a change in the interelectrode resistance R and by the change in wettability, which will affect the mean bubble height ξdn.
Posted by Diya Jain 4 years, 11 months ago
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Yogita Ingle 4 years, 11 months ago
Mutual inductance, between a pair of coils, equals the magnetic flux, linked with one of them due to a change of unit current flowing in the other. Alternatively,The mutual inductance, for a pair of coils, equals the emf induced, in one of them, when the current in the other coil is changing at a unit rate.
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Sia ? 4 years, 5 months ago
Given, Constant electric field of magnitude of 4N/C is acting along the x - axis. we need to find the potential difference between the points - 2 to + 4. here as nothing is given we will take the given points/distances to be in S.I units. From the relation of Potential difference and electric field we know that,
Posted by Sakshi Rathore 4 years, 11 months ago
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Yogita Ingle 4 years, 11 months ago
We know that the charge on an electron is negative and it is -1.6⨯10-19 coulomb.
We need to calculate the number of electrons constituting one coulomb of charge.
e = 1.6 × 10-19 C
Total charge required for 1Coulomb.
∴ q = 1C……….(1)
The formula to calculate the charge is
q = ne
where
q = charge
e = number of electrons
n = q/e……….(2)
Substituting equation (1) in equation (2) we get
n = 1/(1.6 × 10-19)
n = 6.25 × 1018 electrons ≅ 6 × 1018 electrons
So 1 Columb of charge contains 6 × 1018 electrons.
</article>Posted by Hiral Solanki 4 years, 11 months ago
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Yogita Ingle 4 years, 11 months ago
A DC generator is an electrical machine whose main function is to convert mechanical energy into electricity. When conductor slashes magnetic flux, an emf will be generated based on the electromagnetic induction principle of Faraday’s Laws. This electromotive force can cause a flow of current when the conductor circuit is closed.
Posted by Hiral Solanki 4 years, 11 months ago
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Sia ? 4 years, 5 months ago
A DC generator is an electrical machine whose main function is to convert mechanical energy into electricity. When conductor slashes magnetic flux, an emf will be generated based on the electromagnetic induction principle of Faraday's Laws.
Posted by Shiivendra Singh 4 years, 11 months ago
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Yogita Ingle 4 years, 11 months ago
AC Generator
- An electrical generator is a device that converts mechanical energy to electrical energy.
- The generation of alternating currents (ac) is based on the phenomenon of electromagnetic induction.
- Whenever the magnetic flux changes an emf will be induced in the coil.
- AC generator is a device that converts mechanical energy into electrical energy(alternating currents).
- AC generator is an example of inducing an emf or current in a loop by varying the magnetic field and area vector.
Posted by Bhavya Varshney 4 years, 11 months ago
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Gaurav Seth 4 years, 11 months ago
On July 7, HRD Minister Ramesh Pokhriyal announced a major CBSE syllabus reduction with 30% of the syllabus slashed for the year 2020-21 for classes 9 to 12 because of the reduction in classroom teaching time due to the Covid-19 pandemic and lockdown.
CBSE has rationalized the syllabus with the help of suggestions from NCERT and the same has been notified by a new CBSE notification as well.
Deleted syllabus of CBSE Class 12 Physics
Posted by Govind Rawtiya 4 years, 11 months ago
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Meghna Thapar 4 years, 11 months ago
We derived the expression of potential energy in terms of the angle made by the direction of the electric dipole moment and the direction of the external uniform electric field. We found that the potential energy is the negative of the dot product of dipole moment and the electric field.
The potential energy of interaction between dipoles is given by,
V=−4πϵ0r32P1P2
Here the dipole P1 is inclined to the dipole P2 at an angle θ,since the vertical component of P1 is perpendicular to P2 is zero i.e. P1sinθ is zero, taking horizontal component of P1 along P2 i.e. P1cosθ we get
V=−4πϵ0r32P1P2cosθ
V=−r32kP1P2cosθ..........(since, k=4πϵ01)
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