4w Motion of charged particles in E and B Fields Worksheet 051622

If the number density of electrons in a wire is n = 1.00 × 1028 m-3, at what drift velocity must they travel through a wire of diameter d = 0.520 mm to deliver a current of 2.90 A? Give your answer in mm s-1 to 3 significant figures. Take π = 3.14, and the magnitude of the charge on an electron e = 1.60 × 10-¹⁹ C Drift velocity: mm s-1

At room temperature (20°C) the electrical conductivity of Gallium phosphide (GaP) is 63 (2.m)–1, whereas the electron and hole mobility are 0.24 and 0.057 m²/V-s, respectively. a) Compute the intrinsic carrier concentration for GaP at room temperature, (q=1.6 x 10 -19 c). b) If the energy gap of GaP is 0.92 eV, calculate its conductivity at 70°C (k= 8.62 x 10 eV/K). -5

(i) Find the thickness of an isolated block in ‘meter’ capable of being charged to 2.4 x 106Volt potential before sparking into the air, given that dielectric strength of air is 24,000V/cm.   (ii) Find the heat energy(flow) in ‘Joules’ required to prepare a coffee in an electric kettlewith 0.5 litre (1litre = 10-3 m3) of water which is heated from 30ºC to 85ºC?Take density of water as 1000 kg /m3and Specific heat of water as 4.187 kJ/kg º K.

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We have, I = 0.80 A t = 3 hour = 3× 60× 60 = 10800 sec Now, t О %3D 1t %3D( 0.80) ( 10800 ) %3D 8640 С Now, 8640 С —5.4 х 1022 electrons 1,6х 10-19

The astronomical object 4U014 + 61 has the distinction of creating the most powerful magnetic field ever observed.This object is referred to as a “magnetar” (a subclass of pulsars),and its magnetic field is 1.3 * 1015 times greater than the Earth’smagnetic field. (a) Suppose a 2.5-m straight wire carrying a currentof 1.1 A is placed in this magnetic field at an angle of 65° to the field lines. What force does this wire experience? (b) A field thisstrong can significantly change the behavior of an atom. To seethis, consider an electron moving with a speed of 2.2 * 106m>s.Compare the maximum magnetic force exerted on the electronto the electric force a proton exerts on an electron in a hydrogenatom. The radius of the hydrogen atom is 5.29 * 10-11 m

3. The 6-V zener diode in Fig. 7-12 has a maximum rated power dissipated of 690 mW. Its reverse current must be at least 3 mA to keep it in breakdown. Find a suitable value for Rs if V, can vary from 9 V to 12 V and RL can vary from 500 Ω to 1.2 ΚΩ 6V Fig. 7-12 4. If Rs in Exercise 3 is set equal to its maximum permissible value, what is the maximum permissible value of V? 5. If Rs in Exercise 3 is set equal to its minimum permissible value, what is the minimum permissible value of R;? 6. If Rs in Exercise 3 is set equal to 120 Q, what is the minimum rated power dissipated that Rs should have?

Your answer is partially correct. The ammonia molecule NH3 has a permanent electric dipole moment equal to 1.47 D, where 1 D-1 debye unit-3.34 x 10-30 C-m. Calculate the electric potential in volts due to an ammonia molecule at a point 46.7 nm away along the axis of the dipole. (Set V-0 at infinity.) Number 2.26E-5 Units V

A 4.0-nm-diameter protein is in a 0.050 M KCl solution at 25° C. The protein has 9 positive and 20 negative charges. Model the protein as a sphere with a uniform surface charge density. Part A What is the electric potential of the protein at the surface? Express your answer with the appropriate units. μA ? Vsurface = Value Units Submit Request Answer Part B What is the electric potential of the protein 2.0 nm from the surface? Express your answer with the appropriate units. με V2 nm = Value Units Submit Request Answer

In Niels Bohr's 1913 model of the atom, the electron is in a circular orbit around a nucleus. An electron is 5.70 x 10-11 m from a nucleus traveling in a circular orbit with a speed of 2.15 x 106 m/s. What is the magnitude of the magnetic moment due to the electron's motion?

(a)  A wire carrying a 20.5 A current passes between the poles of a strong magnet that is perpendicular to its field and experiences a 2.46 N force on the 3.75 cm of wire in the field. What is the average field strength?                                                                                         Average field strength in tesla =   (b) A spherical surface of area 0.7m2, emissivity 0.85 and temperature 134°C is placed in a large, evacuated chamber whose walls are maintained at a fixed temperature. Find the rate at which radiation is emitted by the surface?( Stefan's constant σ = 5.67 x 10-8 W/m2T4 )                                                                                                                                                                     Energy radiated per second in watts =

In class we showed that for a Lennard-Jones 6/12 interatomic potential one would predict theideal strength of a material to be −2.69U 0 a03 , where U 0 is the bond energy and a0 is theequilibrium bond spacing. Based on the same assumptions, show that Young’s Modulus, E, isgiven by −72U 0 a03 . Assuming U 0 = −1 eV and a0 = 2 Å , provide an order of magnitudeestimate of E in GPa. (While both the predicted ideal strength and value of Young’s modulus area bit on the high side when using the Lennard-Jones 6/12 potential, their ratio (72/2.69 ≈ 27), isrepresentative of that for many materials. In other words, Young’s modulus can be expected tobe ~30 times the value of a material’s ideal strength, which is typically 10-100 times its actualyield strength, making values of Young’s modulus typically ~1,000 times the yield strength.

The free charge density in copper is 1.81x1010 C/m 3 . For a current density of 8x106A/m2, solve the electric field intensity and the drift velocity.Look at the table for more information.

Question B4 a) The strength of the magnetic field B at a distance r from a straight conductor car- is the permeability rying a current I is given by the expression B = of free space with the value 4n × 10-7 NA-2. Two long straight wires are lined up parallel to one another at a separation of 0.2 m. Currents of 4 A and 2 A flow through the wires, both in the same direction. Calculate the value of the magnetic field strength due to the two wires at a point P on the mid-plane between them. where 2r b) Calculate period of a small satellite which is making a circular orbit just outside a planet of density 4.0 × 10³ kg/m³. Provide the answer in SI units and in hours. Use the value of the universal gravitational constant 6.7 x 10-11 N kg-2m-2. c) A mass of 0.01 kg is suspended from a light spring of natural length 80 mm and causes the spring to extend by 10 mm. The mass is pulled down a further 5 mm and then released. Assuming g = 9.8 m/s², calculate: i) the spring constant. ii) the period of…

8:01 PM 4G l QUESTION1 With the aid of diagram Define an electromagnet? Explain with the aid of diagram how electromagnetisms work? Explr ith the aid of diagram what do you mean by right hand rule? Give some strength of electromagnetic fields. What do you mean by electromagnetic induction? Explain with the aid of diagram what is an electromagnetic wave? State the applications of electromagnetism. QUESTION2 ( 2.1 What is an inductor? 2.2. What are the four factors the inductance value depends upon in terms of physical parameters? 2.3 List six types of inductor cores. 2.4 What are self-inductance and Mutual inductance? 2.5 What is called the co-efficient of coupling? 2.6 How to calculate the value of Inductors connected in series and parallel? 2.7 How to calculate the energy stored in an inductor? 2.8 Brief the Inductor behavior in AC and DC circuits 2.9 List four applications of inductors. 2.10 State the relationship between the inductance value of a coil and the amount of emf it…

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Answer #3 with diagram

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In a transistor, IC = 100 mA and IE = 100.5 mA. The value of B is * 100 50 about 1 200

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