Current Electricity — Physics STD 12 Science — Question

When a semiconducting material is doped with an impurity, new acceptor levels are created. In a particular thermal collision, a valence electron receives an energy equal to 2kT and just reaches one of the acceptor levels. Assuming that the energy of the electron was at the top edge of the valence band and that the temperature T is equal to 300K, find the energy of the acceptor levels above the valence band.

Define potential difference and write its unit.

In a calorimeter, the heat given by the hot object is assumed to be equal to the heat taken by the cold object. Does it mean that heat of the two objects taken together remaina constant?

What is the relationship between the radius R of a nucleus and the mass number (A) of an atom?

In resistance box, the resistor wires that are used are joined by folding twice in the shape of the coil. Why?

Can the earth's magnetic field be vertical at a place? What will happen to a lreely suspended magnet at such a place? What is the value of dip here?

An AC source is connected to a capacitor. Will the rms current increase, decrease or remain constant if a dielectric slab is inserted into the capacitor?

Is magnitude of induced electromotive force in any coil depends on resistance of the circuit?

In the circuit shown below, the potential at point A is 100 volts. What will be the potential at point B?