6. Write Biot-Savart's Law formula for a coil, define each parameter in the formula and explain why it is used for?
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- 3. Calculate the magnitude and direction of the magnetic field at the point P for the configuration below. The loops are 10 cm in diameter and 10 cm away from each other. The point P is exactly in the middle point between the two loops. The direction of the current in each loop is shown in the picture and its magnitude is equal to 1.3A1: Figure shows two coils; coil A and coil B. Coil A will generate magnetic field that coil B will see. Using Lenz's law, determine the direction of the current is resistor ab when a. switch S is closed; b. switch S is opened after having been closed for several minutes; c. coil B is brought closer to coil A with the switch S closed; d. the resistance R is decreased while the switch S remains closed. pPART A: Consider a bar magnet sitting to the left of a coil. if the N pole is closest to the coil, what direction does the magnetic field point at the coil's location? A. Toward the Right B. Toward the Left C. depends on the direction of the coils D. not enough information to tell PART B: If a bar magnet is sitting to the left of a coil with its N pole closest to the coil, and the magnet moves toward the coil, the strength of the magnetic field at the location of the coil gets a) weaker b) stays the same c) stronger d) there is no way to tell PART C: As a magnet moves toward a set of coils, the larger the number of coils per meter, the larger the induced current. a) True b) False
- 3. What is the strength of the magnetic field in- side a solenoid with 500 turns and with a 4.0 cm diameter and 30 cm long if we put 22 mA of current through it?quantities increase except for a.) the speed of the bar. b.) the strength of the magnetic field. c.) the distance between the two conducting rods. d.) the resistance of the resistor. e.) All of the above increase the current generated by the apparatus; there are no exceptions. 3.) The resistance of an RLC circuit is doubled. What is true about the resonant frequency of the circuit? W。こ LC a.) The resonant frequency is doubled. b.) The resonant frequency is halved. c.) The resonant frequency is quadrupled. d.) The resonant frequency is reduced by a factor of 1/4th. e.) The resonant frequency is independent of resistance and therefore remains the same. 4.) At high frequencies, the reactances of an inductor and capacitor are N low