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CBSE - XII Science - Physics - Current Electricity

Please can you give me the format, including the procedure in detail, of the effect of intensity of light
(by varying distance of the source) on an LDR using a metre bridge for my investigatory project.

Asked by sunil2791 15th December 2017, 5:03 PM
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CBSE - XII Science - Physics - Current Electricity

The resistance of a tungsten filament at 200oCis 160 ohm. What will be its resistance at 400o C? The temperature coefficient of resistance of tungsten is 0.0045oC-1.

Asked by Topperlearning User 27th April 2015, 3:25 PM
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CBSE - XII Science - Physics - Current Electricity

Write the mathematical relation for the resistivity of material in terms of relaxation time, number density and mass and charge of charge carriers in it. Explain, using this relation, why the resistivity of a metal increases and that of semi-conductor decreases with rise in temperature.

Asked by Topperlearning User 27th April 2015, 3:24 PM
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CBSE - XII Science - Physics - Current Electricity

A wire of resistance 8R is bent in the form of a circle. What is the effective resistance between the ends of a diameter AB?

Asked by Topperlearning User 27th April 2015, 3:23 PM
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CBSE - XII Science - Physics - Current Electricity

A carbon resistance of  is to be marked with rings of different colours for its identification. Write the sequence of colours.

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - XII Science - Physics - Current Electricity

How will you represent a resistance of  by colour code?

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - XII Science - Physics - Current Electricity

Show graphically the variation of resistivity with temperature for (i) Nichrome, (ii) carbon and (iii) semiconductors.

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - XII Science - Physics - Current Electricity

How does the resistivity of (i) conductor (ii) semiconductor vary with temperature?

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - XII Science - Physics - Current Electricity

Why alloys like Manganin, Constantan, Nichrome are used for making wire bound standard resistors?

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - XII Science - Physics - Current Electricity

Name the alloys which are used for making standard resistance coils?

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - XII Science - Physics - Current Electricity

Name two substances whose resistivity decreases with the rise in temperature.

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - XII Science - Physics - Current Electricity

A carbon resistor is marked as orange, yellow, green and silver respectively. What is the approximate resistance of the resistance?

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - XII Science - Physics - Current Electricity

What is temperature coefficient of resistance?

Asked by Topperlearning User 4th June 2014, 1:23 PM
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