The strength of the magnetic field produced by a solenoid depends on:
• The number of turns in the solenoid.
• The material of the core.
• The current flowing through the solenoid.
However, the direction of the current does not affect the field’s strength but only its direction.
Consider the following statements:
A. The junction area of a solar cell is made very narrow compared to a photodiode.
B. Solar cells are not connected with any external bias.
C. LED is made of lightly doped p-n junction.
D. Increase of forward current results in a continuous increase in LED light intensity.
E. LEDs have to be connected in forward bias for emission of light.