Electric Charges and Fields — Physics STD 12 Science — Question

A parallel beam of light of wavelength 500 nm falls on a narrow slit and the resulting diffraction pattern is observed on a screen 1 m away. It is observed that the first minimum is at a distance of 2.5 mm from the centre of the screen. Find the width of the slit.

A solid sphere of radius 5cm floats in water. If a maximum load of 0.1kg can be put on it without wetting the load, find the specific gravity of the material of the sphere.

Discuss the intensity of transmitted light when a polaroid sheet is rotated between two crossed polaroids?

It is proposed to move a particle in simple harmonic motion on a rough horizontal surface by applying an external force along the line of motion. Sketch the graph of the applied force against the position of the particle. Note that the applied force has two values for a given position depending on whether the particle is moving in positive or negative direction.

Write down the basic properties of electric charge.

In a Young's double -slit experiment, the slits are separated by 0.28 mm and the screen is placed 1.4 m away. The distance between the central bright fringe and the fourth bright fringe is measured to be 1.2 cm. Determine the wavelength of light used in the experiment.

State the research done by scientists on electromagnetism after Oersted's observation.

A transmission wire carries a current of 100A. What would be the magnetic field B at a point on the road if the wire is 8m above the road?

How resistivity of material depends on its temperature. Write its empirical formula.

Two identical coils, radius of each is 8 cm and number of turns is 100 are coaxial and their centers are 12 cm apart. If current of 1 A flows in each coil in the same direction, then calculate the magnetic field at the midpoint on the axial line.