Electrostatic Potential and Capacitance — Physics STD 12 Science — Question

The self inductance of a straight conductor is     (a) Zero(b) Very large(c) Infinity(d) Very small

A magnifying glass is used, as the object to be viewed can be brought closer to the eye than the normal near point. This results in;

The magnetic moment of a current (l) carrying circular coil of radius (r) and number of turns (n) varies as

A neutron, a proton, an electron and an α−particle enter a region of uniform magnetic field with equal velocities. The magnetic field is perpendicular to the plane of paper and directed into it. The tracks of particles are labeled in the figure. The neutron follows the track:

Current is flowing in a circular coil of radius r. There are n turns in the coil. Its magnetic moment varies with r. As:

One of the following wavelengths is absent and the rest are present in the X-rays coming from a Coolidge tube. Which one is the absent wavelength?

An electromagnetic wave of frequency v = 3.0MHz  passes from vacuum into a dielectric medium with permittivity ε = 4.0 . Then (a) Wavelength is doubled and the frequency remains unchanged(b) Wavelength is doubled and frequency becomes half(c) Wavelength is halved and frequency remains unchanged(d) Wavelength and frequency both remain unchanged

The gate for which output is high, if at least one input is low is:

The mass of a neutron is:

When a resistance of 2ohm is connected across the terminals of a cell, the current is 0.5 amperes. When the resistance is increased to 5 ohm, the current is 0.25 amperes. The internal resistance of the cell is(a) 0.5 ohm (b) 1.0 ohm(c) 1.5 ohm (d) 2.0 ohm