Wave Optics — Physics STD 12 Science — Question

The magnetic susceptibility is negative for:

1. Pramagnetic materials only.
2. Diamagnetic materials only.
3. Ferromagnetic materials only.
4. Paramagnetic and ferromagnetic materials.

Two insulated charged conducting spheres of radii 20 cm and 15 cm respectively and having an equal charge of 10 C  are connected by a copper wire and then they are separated. Then(a) Both the spheres will have the same charge of 10 C (b) Surface charge density on the 20 cm  sphere will be greater than that on the 15 cm  sphere(c) Surface charge density on the 15 cm sphere will be greater than that on the 20 cm  sphere(d) Surface charge density on the two spheres will be equal

Why was Rutherford’s atomic model unstable?

In AM, the centpercent modulation is achieved when(a) Carrier amplitude = signal amplitude(b) Carrier amplitude ≠  signal amplitude(c) Carrier frequency = signal frequency(d) Carrier frequency ≠ signal frequency

In series connection of resistors, what happens to the current across each resistor?

Consider the two idealized systems: (i) a parallel plate capacitor with large plates and small separation and (ii) a long solenoid of length L > > R, radius of cross-section. In (i) E is ideally treated as a constant between plates and zero outside. In (ii) magnetic field is constant inside the solenoid and zero outside. These idealised assumptions, however, contradict fundamental laws as below:

If the intensity of the radiation incident on a photo-sensitive plate is doubled, how does the stopping potential change?