Current Electricity — Physics STD 12 Science — Question

In Young’s double slit experiment, the distance between the two slits is made half, then the fringe width will become(a) Half(b) Double(c) One fourth(d) Unchanged

The earth’s magnetic field always has a vertical component except at the:

A parallel plate air capacitor has capacity ′C′ farad, potential ′V′ volt and energy ′E′ joule. When the gap between the plates is completely filled with dielectric.

Two lithium nuclei in a lithium vapour at room temperature do not combine to form a carbon nucleus because:

1. A lithium nucleus is more tightly bound than a carbon nucleus.
2. Carbon nucleus is an unstable particle.
3. It is not energetically favourable.
4. Coulomb repulsion does not allow the nuclei to come very close.

A plane mirror reflecting a ray of incident light is rotated through an angle θ about an axis through the point of incidence in the plane of the mirror perpendicular to the plane of incidence, then(a) The reflected ray rotates through an angle 2θ (b) The incident ray is fixed(c) The reflected ray does not rotate(d) a, b

When the separation between two charges is increased the electric potential energy of the charges.

1. Increases.
2. Decreases.
3. Remains the same.
4. May increase or decrease.

The device is based on the principle of mutual induction is:

A man is suffering from colour blindness for green colour. To remove this defect, he should use goggles of (a) Green colour glasses (b) Red colour glasses (c) Smoky colour glasses  (d) None of the above