Semiconductor Electronic: Material, Devices And Simple Circuits — Physics STD 12 Science — Question

Three capacitors of 2.0, 3.0  and  6.0 μF are connected in series to a  10 V  source. The charge on the 3.0 μF  capacitor is

(a) 5 μC

(b) 10 μC

(c) 12 μC

(d) 15 μC

The ratio of the magnetic field at the centre of a current carrying circular wire and the magnetic field at the centre of a square coil made from the same length of wire will be

(a)

(b)

(c)

(d)

Two sources are called coherent if they produce waves:

1. Of equal wavelength.
2. Of equal velocity.
3. Having same shape of wavefront.
4. Having a constant phase difference.

4 eV is the energy of the incident photon and the work function in 2eV. What is the stopping potential

(a) 2V

(b) 4V

(c) 6V

(d) 2

The SI unit of dipole moment is:

The figure shows the intensity-wavelength relations of X-rays coming from two different Coolidge tubes. The solid curve represents the relation for the tube A in which the potential difference between the target and the filament is V_A and the atomic number of the target material is Z_A. These quantities are V_B and Z_B for the other tube. Then:

In the following circuits PN-junction diodes D₁, D₂ and D₃ are ideal for the following potential of A and B, the correct increasing order of resistance between A and B will be

(i) – 10 V, – 5V (ii)  – 5V, – 10 V   (iii) – 4V, – 12V

 

(a) (i) < (ii) < (iii)

(b) (iii) < (ii) < (i)

(c) (ii) = (iii) < (i)

(d) (i) = (iii) < (ii)

A particle is dropped from a height H. The de Broglie wavelength of the particle as a function of height is proportional to:

When we double the radius of a coil keeping the current through it unchanged, what happens to the magnetic field directed along its axis at far off points?

Gauss’s law is true only if force due to a charge varies as: