Electrostatic Potential and Capacitance — Physics STD 12 Science — Question

A parallel-plate capacitor is connected to a battery. A metal sheet of negligible thickness is placed between the plates. The sheet remains parallel to the plates of the capacitor:

1. The battery will supply more charge.
2. The capacitance will increase.
3. The potential difference between the plates will increase.
4. Equal and opposite charges will appear on the two faces of the metal plate.

A proton is moving along Z-axis in a magnetic field. The magnetic field is along X-axis. The proton will experience a force along(a) X-axis                                           (b) Y-axis(c) Z-axis(d) Negative Z-axis

Temperature above which a ferromagnetic substance becomes paramagnetic is called(a) Critical temperature(b) Boyle's temperature(c) Debye's temperature(d)  Curie temperature

The plane faces of two identical plano-convex lenses each having focal length of 40 cm are pressed against each other to form a usual convex lens. The distance from this lens, at which an object must be placed to obtain a real, inverted image with magnification one is(a) 80 cm (b) 40 cm(c) 20 cm (d) 162 cm

If the potential difference applied to the tube is doubled and the separation between the filament and the target is also doubled, the cutoff wavelength:

Alnico is used for making permanent magnets because it has:

Which one of the following is similar between electrostatic force and gravitational force?

Out of the following sources which gives best monochromatic light ?