Question
By giving example of bar magnet, explain its basic properties.

Answer

SELF

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

Find the reading of the spring balance shown in figure. The elevator is going up with an acceleration of $\frac{\text{g}}{10},$ the pulley and the string are light and the pulley is smooth.
Consider the situation shown in figure. The wire PQ has a negligible resistance and is made to slide on the three rails with a constant speed of 5cm/s. Find the current in the $10\Omega$ resistor when the switch S is thrown to:
  1. The middle rail.
  2. The bottom rail.

The gravitational attraction between electron and proton in a hydrogen atom is weaker than the coulomb attraction by a factor of about 10–40. An alternative way of looking at this fact is to estimate the radius of the first Bohr orbit of a hydrogen atom if the electron and proton were bound by gravitational attraction. You will find the answer interesting.
A thin convex lens of focal length 25cm is cut into two pieces 0.5cm above the principal axis. The top part is placed at (0, 0) and an object placed at (-50cm, 0). Find the coordinates of the image.
By defining electric dipole and dipole moment, find the necessary formula for the field intensity at any point located on the neutral (equatorial plane) of the dipole.
A battery of emf 100V and a resistor of resistance $10\text{k}\Omega$ are joined in series. This system is used as a source to supply current to an external resistance R. If R is not greater than $100\Omega,$ the current through it is constant up to two significant digits. Find its value. This is the basic principle of a constant-current source.
A particle is fired vertically upward with a speed of 15km/s. With what speed will it move in intersteller space. Assume only earth's gravitational field.
  1. With the help of a suitable ray diagram, derive the mirror formula for a concave mirror.
  2. The near point of a hypermetropic person is 50 cm from the eye. What is the power of the lens required to enable the person to read clearly a book held at 25 cm from the eye?
A group of students while coming from the school noticed a box marked "Danger H.T. 2200 V" at a substation in the main street. They did not understand the utility of such a high voltage, while they argued, the supply was only 220 V.They asked their teacher this question the next day. The teacher thought it to be an important question and therefore explained to the whole class.
Answer the following questions:
  1. What device is used to bring the high voltage down to low voltage of a.c. Current and what is the principle of its working?
  2. Is it possible to use this device for bringing down the high d.c. Voltage to the low voltage? Explain.
  3. Write the values displayed by the students and the teacher.
Two point charges of magnitude +q and -q are placed at $\Big(-\frac{\text{d}}{2},0,0\Big)$ and $\Big(\frac{\text{d}}{2},0,0\Big)$, respectively. Find the equation of the equipoential surface where the potential is zero.