To prevent demagnetisation the bar magnets are arranged in pairs with... poles facing each other

Magnetic keepers are used for ............... magnets

Lines of force runs from ___ to ___ inside the magnets

A magnet has pole strength 3Am and moment 24 Am2 Then find its length?

The smallest value of x² – 3x + 3 in the interval is

The alternate way to solve the question is to put both the values of interval of the function. Then we compare the values. We also check if the first derivative is postive or negative. If it's negative, the given function is decreasing. And if postive, the given function is increasing.

Net magnetic field at the centre of the circle O due to a current carrying loop as shown in figure is

Deflection of galvanometer in the circuit is 71 divisions. A shunt of is connected parallel to galvanometer and value of R is adjusted such that main current remains the same. If the deflection in the galvanometer falls to 15 divisions then the resistance G of galvanometer is (in ohm)

Three long straight and parallel wires carrying currents are arranged as shown in figure. The wire 'B' which carries a current of 5A is so placed that it experiences no force. The distance of wire ' B ' from A is then

A semi circular current loop is placed in an uniform magnetic field of 1 tesla as shown. If the radius of loop is 1m, the magnetic force on the loop is

Two long parallel wires carrying currents 2.5A and I amp in the same direction (directed into plane) are held at P and Q respectively as shown. The points P and Q are located at 5m and 2m respectively from a collinear point R. An electron moving with a velocity of along positive x axis experiences a force of at the point 'R'. The value of I is

Wires 1 and 2 carrying currents and respectively are inclined at an angle to each other. What is the force on a small element dl of wire 2 at a distance from wire 1 due tomagnetic field of wire 1 ?

An electron accelerated through a potential difference 'V' passes through a uniform transverse magnetic field and experiences a force F. If the accelerating potential is increased to 2V, the electron in the same magnetic field will experience a force

A plane metallic sheet is placed with its face parallel to lines of magnetic induction B of a uniform field. A particle of mass m and charge q is projected with a velocity from a distance ' d ' from the plane normal to the lines of induction. Then the maximum velocity of projection for which the particle does not hit the plane is,

Which of the following describes the criterion of spontaneity

A solution of sodium sulphate is electrolyzed using inert electrodes and the gases evolved are stored in a container. What is the mole fraction of gas in container which have higher concentration.

The function 2x³ – 9x² + 12x – 3 is increasing when x belongs to the interval

We should know the way to find the minimum or maximum value.