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State the working principle of a potentiometer with help of the circuit diagram, explain how the internal resistance of a cell is determined. (b) How are the following affected in the potentiometer circuit when (i) the internal resistance of the driver cell increases and (ii) the series resistor connected to the driver cell is reduced ? Justify your answer

Posted by Raj Pasi 8 years ago

CBSE > Class 12 > Physics

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Physics 2017 delhi set1

Posted by Sudhanshu Saini 8 years ago

CBSE > Class 12 > Physics

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How solenoid is equivalent to a bar magnet

Posted by Shreya Choudhary 8 years ago

CBSE > Class 12 > Physics

2 answers

Saurav Kumar 8 years ago

In both of them, the magnetic field lines emerge from one end and terminate at the another end and move parallel to each other inside their cores

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Dc Cc 8 years ago

Both of them produce uniform magnetic field

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What is the dynamic mass of photon of frequency

Posted by Roopali Singh 8 years ago

CBSE > Class 12 > Physics

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How is a capacitor charged?

Posted by Sanjana Tyagi 8 years ago

CBSE > Class 12 > Physics

1 answers

Nauman Akhtar 8 years ago

When a battery is connected to a series resistor and capacitor, the initial current is high as the battery transports charge from one plate of the capacitor to the other. ... Charging the capacitor stores energy in the electric field between the capacitor plates.and the of charging typically described in term of time constant RC. Vb = Vr + Vc Vb = Ir + Q/C? (as charging progresses)....

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Plot a graph showing the variation of current 'I'' verses resistance 'R' connected to a cell of emf E and ineternal resistance 'r'

Posted by Nithish Kumar 8 years ago

CBSE > Class 12 > Physics

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the region between two concentric spheres of radii a and b is filled with a conducting material with resistivity

Posted by Ashish Kant Vimal 8 years ago

CBSE > Class 12 > Physics

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What is diverge and converge

Posted by Luksh Kumar 8 years ago

CBSE > Class 12 > Physics

2 answers

Tanuja Biswas 8 years ago

Diverge means to spread away from a point. Whereas Converge means to come from different directions and meet at a point.

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Sakshi Arora 8 years ago

Diverge isconcav mirror and converging is concave mirror

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show that the resistance between the spheres is given by R=p/4♫(1/a- 1/b)

Posted by Ashish Kant Vimal 8 years ago

CBSE > Class 12 > Physics

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Is rainball can be seen in night?

Posted by Raman Dhiman 8 years ago

CBSE > Class 12 > Physics

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Define prism law

Posted by Saruchi Sharma 8 years ago

CBSE > Class 12 > Physics

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If the distance between source of light and cathode of photocell is doubled, how does it affect stopping potential

Posted by Shamama Rehman 8 years ago

CBSE > Class 12 > Physics

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Draw equipotential surface due to an electric dipole.

Posted by Ragini Mishra 8 years ago

CBSE > Class 12 > Physics

1 answers

Sanidhya Jain 8 years ago

(((-)))(((+)))

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What is the value of Earths magnetic field inside a metallic cage

Posted by Sarthak Goel 8 years ago

CBSE > Class 12 > Physics

1 answers

Dushyant Tyagi 8 years ago

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What is dielectric?

Posted by Pallavi Jena 8 years ago

CBSE > Class 12 > Physics

1 answers

Kanika Bhati 8 years ago

Are insulating material which transmit electric effects without conducting.

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A message signal of frequency 20 KHz and peak voltage of 20 volts is used to modulate a carrier signal of frequency 2 MHz and peak voltage of 40 volts. Determine (i) modulation index, (ii) the side bands produced. Draw the corresponding frequency spectrum of amplitude modulated signal.

Posted by Rimpi Metha 8 years ago

CBSE > Class 12 > Physics

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Power factor

Posted by Prince Namdev 8 years ago

CBSE > Class 12 > Physics

0 answers

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What is the formula of capacitor

Posted by Nitin Nitin 8 years ago

CBSE > Class 12 > Physics

3 answers

Sanjana Tyagi 8 years ago

Q=cv

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Gautam Singh 8 years ago

Q/V

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Nitin Nitin 8 years ago

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Two wires A and B of the same material and having same length, have their cross sectional areas in the ratio 1:6. What would be the ratio of heat produced in these wires when same voltage is applied across each?

Posted by Rimpi Metha 8 years ago

CBSE > Class 12 > Physics

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Two points charges 4Q and Q are separated by a distance 1m in air.At what point on the line joining the charges is the electric field intensity zero.

Posted by Gautam Singh 8 years ago

CBSE > Class 12 > Physics

2 answers

Gautam Singh 8 years ago

How

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Ashwani Kumar 8 years ago

At equal to mid point

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What is electron,neutron ,proton nucleus

Posted by Gautam Singh 8 years ago

CBSE > Class 12 > Physics

1 answers

Rachit Goyal 8 years ago

Do u know what is atom ? All these are inside it. N there arrangement was well described by Bohr!

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two point charges are + q and minus 2Q placed at the vertices B and C of an equilateral triangle ABC of side a obtain the expression for the magnitude and the direction of the resultant electric field at the vertex a due to these two charges

Posted by Shambhu Kumar 8 years ago

CBSE > Class 12 > Physics

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Draw electric line of forces due to an electric dipole.

Posted by Raj Mohan Yadav 8 years ago

CBSE > Class 12 > Physics

1 answers

Ayush Tripathi 8 years ago

The electric lines of forces can be drawn as electric field lines come radially out of the +ve charge of dipole and radially enters in -certainly charge of Dipole.

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Sir which type of paper will come in the board...

Posted by Satwik Singh 8 years ago

CBSE > Class 12 > Physics