Soft iron is used to make core of transformer because of its

Views: 5,430 18 × 1 0 − 6 T. At this location, magnetic needle of length 0.12 m and pole strength 1.8 A − m is suspended from its mid point using a thread, it makes 4 5 ∘ angle with horizontal in equilibrium. To keep this needle horizontal, the vertical force that should be applied at one of its ends is (a) 6.5 × 1 0 − 5 N (b) 3.6 × 1 0 − 5 N (c) 1.3 × 1 0 − 5 N (d) 1.8 × 1 0 − 5 N Views: 5,941 AC component. This AC component in the DC output of a rectifier is called ripple and is shown at the output of the rectifier. It is removed by using a filter circuit. The output of the filter circuit is almost a pure DC. (It can still contain some ripple). The voltage regulator circuit shown after the filter restricts the output voltage to the desired value. The output voltage at this stage is a across pure D C ( d ) Views: 5,210 20 g and moving in opposite directions with speed of 5 m / s each, collide and rebound with the same speed. If the collision lasts for 1 0 − 3 sec, which of the following statements are true? (a) The impulse imparted to each ball is 0.2 N-s (b) The impulse imparted to each ball is 0.4 N-s and the force exerted on each ball is 400 N (c) The impulse imparted to each ball is 0.4 kgm / s and the force exerted on each ball is 4 × 1 0 − 5 N (d) The impulse and the force on each ball are equal in magnitude and opposite in direction

In Ferrites [ ] Ferrites are ceramic compounds of the • Manganese-zinc ferrite ( MnZn, with the formula Mn aZn (1−a)Fe 2O 4). MnZn have higher • Nickel-zinc ferrite ( NiZn, with the formula Ni aZn (1−a)Fe 2O 4). NiZn ferrites exhibit higher resistivity than MnZn, and are therefore more suitable for frequencies above 1MHz. For applications below 5MHz, MnZn ferrites are used; above that, NiZn is the usual choice. The exception is with As any given blend has a trade-off of maximum usable frequency, versus a higher mu value, within each of these sub-groups, manufacturers produce a comprehensive range of materials for different applications blended to give either a high initial (low frequency) inductance or lower inductance and higher maximum frequency, or for interference suppression ferrites, an extensive frequency range, but often with a very high loss factor (low It is essential to select the suitable material for the application, as the correct ferrite for a 100kHz Applications [ ] There are two broad applications for ferrite cores that differ in size and frequency of operation: signal transformers, which are of small size and higher frequencies, and power transformers, which are of large size and lower frequencies. Cores can also be classified by shape, such as The ferrite cores used for power transformers work in the low-frequency range (1 to 200kHz usually The ferrite cores used for signals have a range of applications from 1kHz to many MHz, perhaps as much as 300MHz, a...

Soft Iron Core A soft iron core that becomes a magnet temporarily when current flows through a coil of wire that surrounds it. From: Modern Dictionary of Electronics (Seventh Edition), 1999 Related terms: • Energy Engineering • Semiconductor • Electronics • Electrostatics • Magnetic Fields • Electric Potential • Measurer A moving coil meter is a very commonly used form of analogue voltmeter because of its sensitivity, accuracy, and linear scale, although it only responds to d.c. signals. As shown schematically in Figure 7.3 , it consists of a rectangular coil wound round a soft iron core that is suspended in the field of a permanent magnet. The signal being measured is applied to the coil, which produces a radial magnetic field. Interaction between this induced field and the field produced by the permanent magnet causes torque, which results in rotation of the coil. The amount of rotation of the coil is measured by attaching a pointer to it that moves past a graduated scale. The theoretical torque produced is given by (7.2) T = B I h w N , where B is the flux density of the radial field, I is the current flowing in the coil, h is the height of the coil, w is the width of the coil, and N is the number of turns in the coil. If the iron core is cylindrical and the air gap between the coil and pole faces of the permanent magnet is uniform, then the flux density B is constant and Equation (7.2) can be rewritten as (7.3) T = K I , that is, torque is proportional to the coil curr...