Electric Charges and Fields — Physics STD 12 Science — Question

The dimensions of linear charge density is:

When a dielectric material is introduced between the plates of a charges condenser, then electric field between the plates (a) Remain constant(b) Decreases(c) Increases(d) First increases then decreases

Magnetic field inside a solenoid is:

Two equal positive charges are kept at points A and B. The electric potential at the points between A and B (excluding these points) is studied while moving from A to B. The potential.

1. Continuously increases.
2. Continuously decreases.
3. Increases then decreases.
4. Decreases then increases.

When light is incident on a doubly refracting crystal, two refracted rays-ordinary ray (O-ray) and extra ordinary ray (E-ray) are produced. Then(a) Both O-ray and E-ray are polarised perpendicular to the plane of incidence(b) Both O-ray and E-ray are polarised in the plane of incidence(c) E-ray is polarised perpendicular to the plane of incidence and O-ray in the plane of incidence(d) E-ray is polarised in the plane of incidence and O-ray perpendicular to the plane of incidence

Figure shows a horizontal solenoid connected to a battery and a switch. A copper ring is placed on a frictionless track, the axis of the ring being along the axis of the solenoid. As the switch is closed, the ring will:

1. Remain stationary.
2. Move towards the solenoid.
3. Move away from the solenoid.
4. Move towards the solenoid or away from it depending on which terminal (positive or negative) of the battery is connected to the left end of the solenoid.

Two parallel wires carry currents of 20A and 40A in opposite directions. Another wire carying a current anti parallel to 20A is placed midway between the two wires. T he magnetic force on it will be:

In the following transitions, which one has higher frequency(a) 3 – 2(b) 4 – 3(c) 4 – 2(d) 3 – 1