What is a perfect black body ?
A body that absorbs the entire radiation energy incident on it is called a…
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In a workshop a worker measures the length of a steel plate with a Vernier callipers having a least count 0.01 cm. Four such measurements of the length yielded the following values: 3.11 cm, 3.13 cm, 3.14 cm, 3.14 cm. Find the mean length, the mean absolute error and the percentage error in the measured value of the length.
Advantages of potentiometer over a voltmeter. Also state about its disadvantages
Advantages of potentiometer Accuracy of any potentiometer can be increased by increa…
Why cell phone doesn't works in a closed elevator
For a cell phone to work, it must be able to recieve electromagnetic signals. When a c…
Which property of soft iron makes it useful for preparing an electromagnet
An electromagnet should become magnetic when a current is passed through its coil, b…
What is retentitivty and coercivity
The residual magnetic flux density or magnetization in a magnetic material when the ma…
What is Kirchhoff's law?
There are two laws of Kirchhoff which are used while studying the electri…