Magnetism And Matter — Physics STD 12 Science — Question

On going from north pole to equator, the value of angle of dip :

A parallel plate capacitor has a capacity C. The separation between the plates is doubled and a dielectric medium is introduced between the plates. If the capacity now becomes 2C, the dielectric constant of the medium is(a) 2 (b) 1(c) 4  (d) 8

Alternative current generator is basically based upon:

A capacitor of capacitance C is charged to a potential V. The flux of the electric field through a closed surface enclosing the capacitor is:

For a normal eye, the least distance of distinct vision is(a) 0.25 m(b)  0.50 m (c) 25 m (d)  Infinite 

In a diffraction pattern by a wire, on increasing diameter of wire, fringe width(a) Decreases(b) Increases(c) Remains unchanged(d) Increasing or decreasing will depend on wavelength

Statement(A): Negative charges always move from a higher potential to lower potential point
Statement (B): Electric potential is vector.

A magnetic field can be produced by :

A proton and an electron both moving with the same velocity v enter into a region of magnetic field directed perpendicular to the velocity of the particles. They will now move in circular orbits such that(a) Their time periods will be same(b) The time period for proton will be higher(c) The time period for electron will be higher(d) Their orbital radii will be same

The wave nature of light was established by:

1. Maxwell’s equations.
2. Fraunhoffer’s lines
3. Hertz experiment.
4. Einstein’s theory.