Power is directly proportional as well as inversely proportional by two formulae.How does one justify?

P=V^{2}/R as well as p=I^{2} R.

Answer:

This means that for a given current, (i.e, when current is

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# Tag: series

## Proportionality relation in electric power

## An idea shared by Eddie on speed of light barrier

## A numerical problem on Drift velocity

## Prepare for Science Quizzes online

## you are given two nichrome wire of same length and different thickness Which wire will get heated first Give reason.?

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Power is directly proportional as well as inversely proportional by two formulae.How does one justify?

P=V^{2}/R as well as p=I^{2} R.

Answer:

This means that for a given current, (i.e, when current is

If 24 lights in a series around a circle are wired so that each one switches on as soon as it “sees” the one next to it go on, and switches off as soon as it “sees” the one next to it go off, will the pattern of lights revolve around the circle at a [...]

Two conducting wires X and Y of same diameter but different materials are joined in series across a battery . if the number density of electrons in X is twice that in Y . Find the ratio of drift velocity of electrons in the two wires. (Adithya Singh asked this) Incoming search terms:i want to [...]

We are starting a series of quizzes to enable the students to practice for online quizzes. Take the sample quiz below for getting an idea on how the quizzes will be coming. If you like it, let us know. Post your reactions as comment to this post. Based on the popularity, we will be adding [...]

You are given two nichrome wire of same length and different thickness Which wire will get heated first Give reason.? Asked Merlin Mary Mathew Answer: If the wires are connected one by one to a source, (or connected in parallel to the same source) the one having less resistance (Greater thickness) will get heated up first. [...]

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**GENERAL INSTRUCTIONS: **

- All questions are compulsory.
- There are 30 questions in total. Questions 1 to 8 carry one mark each, questions 9 to 18 carry 2 marks each, questions 19 to 27 carry 3 marks each and questions 28 to 30 carry 5 marks each.
- There is no overall choice. However an internal choice has been provided in one question of two marks, one question of 3 marks and all three questions of five marks. You have to attempt ony one of the choices in such cases.
- Use of calculators is not permitted.

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- What is the polarizing angle of a medium of refractive index √3 ?
- Consider the circuit shown, where APB and AQB are semicircles. What will be the magnetic field at the centre ‘C’ of the circular loop?
- The closed loop PQRS is moving into uniform magnetic field acting at right angles to the plane of the paper as shown in the figure. State the direction in which the induced current flows in the loop.
- What is the angle between the directions of electric field at any point on the equatorial line of an electric dipole and the dipole moment?
- Draw the voltage current characteristics of a zener diode.
- What is the shortest wavelength present in the Paschen series of spectral lines?
- Name the constituent radiation of the electromagnetic spectrum which
- Has the wavelength range between 390 nm and 770 nm
- Is absorbed from sunlight by ozone layer.

Calculate the potential at the centre of a square of side √ 2 m, which carries at its four corners, charges of +2nC, +1nC, -2nC and -3nC respectively. State the condition under which the phenomenon of resonance occurs in a series LCR circuit. Plot a graph showing the variation of current with frequency of the ac source in an LCR circuit. Show that the total energy stored in an inductor L, when a current I is established through it is ½ LI2 . Draw the energy level diagram showing the ground state and next few excited states for H atom. Mark the transition which corresponds to the emission of the spectral series for Balmer series.The graph shows the variation of voltage(V) across the plates of two capacitors A and B versus increase of charge (Q) stored on them, which of the two capacitors have higher capacitance? Give reason for your answer.

A TV tower has a height of 400m at a given place. Calculate its coverage range if the radius of the earth is 6400 km. Find the wavelength of electromagnetc waves of 5 x 1019 Hz in free space. Give its two applications.How does the resolving power of a compound microscope change on]- Decreasing the wavelength of light used
- Decreasing the diameter of its objective lens
OR

In a single slit diffraction pattern,

(Collected from **Previous Board Question Papers** and **CBSE Sample Papers** and**Guess Papers **made by experienced teachers)

(b)Calculate the current drawn from the electric supply.

(c)Calculate the total energy