Blog

A small bar magnet experiences a 1.80×10−2 N

A 25.0 nF capacitor is connected across an AC generator that produces a peak voltage of 5.90 V. At what frequency  is the peak current 42.0 mA?

A 10 cm x 10 cm square is bent at a 90 angle. A uniform 6.4×10−2 T magnetic field points downward at a 45

A 15.0 mH inductor is connected across an AC generator that produces a peak voltage of 9.20 V.  a) What is the peak current through the inductor if the emf frequency is 100 Hz? (3 points)   b) What is the peak current through the inductor if the emf frequency is 100 kHz? (3 points)

Refracting telescope: The objective and the eyepiece of a refracting astronomical telescope have focal lengths of 320 cm and 4.0 cm, respectively. The telescope is used to view Neptune and the final image is set at infinity. The diameter of Neptune is 4.96 × 107 m and the distance from the earth at the time of observation is 4.4 × 1012 m. What is the angle (in mrad) subtended by the final telescopic image of Neptune?

Field intensity: Near the earth the intensity of radiation from the sun is 1.35 kW/m2. What volume of space in this region contains 1.0 J of electromagnetic energy? (c = 3.0 × 108 m/s, μ0 = 4π × 10-7 T ∙ m/A, ε0 = 8.85 × 10-12 C2/N ∙ m2)

What value of resistor R gives the circuit in the figure above a time constant of 16

A 9.0 mH inductor is connected in parallel with a variable capacitor. The capacitor can be varied from 100 pF to 340 pF. a) What is the minimum oscillation frequency for this circuit? (2 points) b) What is the maximum oscillation frequency for this circuit?  (2 points)

A3.0 mH inductor is connected in parallel with a variable capacitor. The capacitor can be varied from 160 pF to 280 pF. a) What is the minimum oscillation frequency for this circuit? (2 points) b) What is the maximum oscillation frequency for this circuit?  (2 points)

Assume that a 7.0 cm diameter, 100 W light bulb radiates all its energy as a single wavelength of visible light. (