Graph Numerical on Electricity & Magnetism || Very Important Question 🔥🔥|| Class 12 || In Nepali ||

In text Question
An infinitely long straight conductor is bent into the shape as shown in the figure. It carries a current of ‘I’ ampere and the radius of the circular loop is ‘r’ meter. Find the magnetic induction at the center of the circular part.
Figure ??
Some important Questions
➡️ A Silver wire has 1x1030 free electrons per cubic meter, a cross sectional area of 2 mm² and carries a current of 5 A. Calculate the force acting on each electron if the wire is now placed in a magnetic field of flux density 0.15 T which is perpendicular to the wire.
➡️ An electron of K.E 10 eV is moving in a circular orbit of radius 11 cm, in a plane at right angle to a uniform magnetic field. Determine the value of flux density. [Mass of an electron = 9.1 * 10 ^ - 31 , e = 1.6 * 10 ^ - 19 * C ]
➡️ A horizontal straight wire of mass 0.12gm and length 10cm is placed perpendicular to a uniform horizontal magnetic field of flux density 0.6T. If the resistance per unit length of the wire is 3.80m², calculate the potential difference that has to be applied between the ends of the wire to make it just self-supporting.
➡️ A horizontal straight wire 5 cm long weighing 1.2 gm¹ is placed perpendicular to a uniform horizontal magnetic field of flux density of 0.6 T. If the resistance per unit length of the wire is 3.8 m²¹, calculate the p.d. that has to be applied between the ends of the wire to make it just self-supporting.
➡️A copper wire 28 m long is wound into a flat circular coil 8.0 cm in diameter. If the current of 4.50A flows through the coil, what is the magnetic induction at the centre?
➡️A wire of length 62.8m carrying current 10A is bent into a circular coil of radius 10cm. Calculate the magnetic field at the centre.
↪️full wave and Half wave rectifiers.
↪️advantages and disadvantages of half wave and full wave rectifiers.
↪️why Zener diode is Known as voltage regulator.
↪️Describe briefly three experimentally observed features in the phenomenon of photoelectric effect. Discuss briefly how wave theory of light cannot explain these features.
↪️what is Bohr's frequency. write down any three postulates of Bohr's atomic model.
↪️State and explain de-Broglie hypothesis.
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