Nuclei — Physics STD 12 Science — Question

An ac input signal of frequency 60Hz is rectified by a (i) half wave (ii) full wave rectifier. Draw the output waveform and write the output frequency in each case.

What is the physical significance of negative energy of electron in Bohr's atom?

Obtain the equation of electric energy of a single (solo) charge.

An electron is not deflected while passing through any field. Is it possible that there is no magnetic field present at that place? Explain.

Explain from where does the dissipated power in the resistor come form. 
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Write a short note on electric cell.

When light travels from an optically denser medium to a rarer medium, why does the critical angle of incidence depend on the color of the light?

What conclusion can you draw from the following observations on a resistor made of alloy manganin?

Current A	Voltage V	Current A	Voltage V
0.2  0.4 0.6 0.8 1.0 2.0	3.94 7.87 11.8 15.7 19.7 39.4	3.0 4.0 5.0 6.0 7.0 8.0	59.2 78.8 98.6 118.5 138.2 158.0

Using Ampere’s circuital law, obtain an expression for the magnetic field along the axis of a current carrying solenoid of length l and having N number of turns.