فيزياء كهربية ومغناطيسية

شرح الاستقطاب داخل المكثفات ولماذا تزداد سعة المكثف عن وضع مادة عازلة وحساب الشحنة الكهربية المستحثة

توصيل المكثفات علي التوالي والتوازي وحساب الشحنة والجهد والطاقة علي كل مكثف…ومسائل الشحن والتفريغ

اساساسيات الدواير الكهربية..قوانين كيرشوف وحساب فرق الجهد بين نقطتين في الدواير الكهربية

.حساب القوة المغناطيسية المؤثرة علي شحنة متحركة داخل مجال مغناطيسي وشرح الضرب الاتجاهي

المقارنة بين القوي الكهربية والقوي المغناطيسية،المقارنة بين المجال الكهربي والمغناطيسي

شرح القوة المغناطيسية المؤثرة علي سلك وعلي مسار مغلق والعزم وكمية الحركة المغناطيسية

Charged Particles Moving in Electric and Magnetic Fields Force on a Wire (conductor) carrying a current Force on rectangular loop carries a current I in a uniform magnetic field (B) Torque on current loop The maximum torque Magnetic Dipole Moment

An electron moves through a uniform magnetic field given by ? = ? ?̂ + 3? ?̂. At a particular instant, the electron has velocity ? = 2.0?̂ + 4.0?̂ m/s and the magnetic force acting on it is (6.4 × 10 ?)?. Find Bx A particle with positive charge q=3.2x10-19C moves with a velocity ? = 2.0?̂ + 3.0?̂ − ̂3.0? m/s through a region where both a uniform magnetic field and a uniform electric field exist. (a) Calculate the total force on the moving particle (in unit-vector notation), taking ? = (2?̂ + 4?̂ + ?) T and ? = (4?̂ − ?̂ − 2?) V/m. (b) What angle does the force vector make with the positive x axis? A wire 2.80 m in length carries a current of 5.00 A in a region where a uniform magnetic field has a magnitude of 0.390 T. Calculate the magnitude of the magnetic force on the wire assuming the angle between the magnetic field and the current is (a) 60.0o, (b) 90.0o, and (c) 120o. A conductor suspended by two flexible wires as shown in the figure has a mass per unit length of 0.040 0 kg/m. What current must exist in the conductor in order for the tension in the supporting wires to be zero when the magnetic field is 3.60 T into the page? What is the required direction for the current

The upper portion of the given circuit is fixed. The horizontal wire at the bottom has a mass of 10.0 g and is 5.00cm long. This wire hangs in the gravitational field of the Earth from identical light springs connected to the upper portion of the circuit. The springs stretch 0.500 cm under the weight of the wire, and the circuit has a total resistance of 12.0 V. When a magnetic field is turned on, directed out of the page, the springs stretch an additional 0.300 cm. Only the horizontal wire at the bottom of the circuit is in the magnetic field. What is the magnitude of the magnetic field? In the given figure, the cube is 40.0 cm on each edge. Four straight segments of wire- ab, bc, cd, and da-form a closed loop that carries a current I = 5.00 A, in the direction shown. A uniform magnetic field of magnitude B= 0.020 0 T is in the positive y direction. Determine the magnitude and direction of the magnetic force on each segment. A current of 17.0 mA is maintained in a single circular loop of 2.00 m circumference. A magnetic field of 0.800 T is directed parallel to the plane of the loop. (a) Calculate the magnetic moment of the loop. (b) What is the magnitude of the torque exerted by the magnetic field on the loop?