Dual Nature of Radiation and Matter — Physics STD 12 Science — Question

In a transistor, both emitter and collector regions are of the same nature of doping. Can these regions be interchanged?

In an n-type silicon, which of the following statement is true:

1. Electrons are majority carriers and trivalent atoms are the dopants.
2. Electrons are minority carriers and pentavalent atoms are the dopants.
3. Holes are minority carriers and pentavalent atoms are the dopants.
4. Holes are majority carriers and trivalent atoms are the dopants.

Voltage across the ends of inductor, capacitor and resistor in a series LCR circuit is 20 V, 20 V and 40 V respectively. What is the phase difeerence between the current and applied voltage in the circuit?

Which quantity remain constant in a transformer? Current, potential, frequency or power?

Define the term ‘dielectric constant’ of a medium in terms of capacitance of a capacitor.

Why there is internal resistance in any cell?

Under what condition the force acting on a charge moving through a uniform magnetic field is minimum?

Show on a graph, the variation of resistivity with temperature for a typical semiconductor.