All posts by : atif

A magnifying glass can burn paper due to a phenomenon known as the “focusing effect.” When sunlight passes through the convex lens of a magnifying glass, it is refracted and converged onto a single point, which is known as the “focal point.”

If the magnifying glass is held at the right distance and angle, the focused light can become intense enough to heat the paper to its ignition point, causing it to burn. This happens because the focused light has a high concentration of energy per unit area, which can generate enough heat to cause the paper to catch fire.

The output of a transformer is zero when DC voltage is applied to its primary coil because a transformer operates on the principle of electromagnetic induction, which requires a changing magnetic field to induce a voltage in the secondary coil.

In a DC circuit, the voltage applied to the primary coil is constant, and therefore, the magnetic field around the coil remains constant as well. Since there is no changing magnetic field, there is no voltage induced in the secondary coil, and the output of the transformer is zero.

Similarities:

Isotopes of an element have the same number of protons in the nucleus, which determines the element’s atomic number. This means that isotopes of an element have the same chemical properties and will react with other elements in the same way.

Differences:

However, isotopes of an element can have different numbers of neutrons in the nucleus. This means that isotopes of an element can have different atomic masses. The different number of neutrons in the nucleus can affect the stability and properties of the isotope.