Q25)
Q25) Two-point charges of 3 × 10-6 C and -5 × 10-6 C are separated by a distance of 0.4 meters.
a) Calculate the magnitude of the electric force between them?
b) and determine whether it is attractive or repulsive?
Q26)
Q26) A 4.7 μF capacitor is connected to a 12 V power supply.
Calculate: a) the charge stored in the capacitor?
b) the energy stored in the capacitor.
Q27)
Q27) A rectangular loop of wire with dimensions 5 cm × 8 cm is placed in a uniform magnetic field of 0.25 T.
Calculate the magnetic flux through the loop when:
a) the field is perpendicular to the loop?
b) the field makes a 30° angle with the normal to the loop?
c) the field is parallel to the loop.
Q28)
Q28) Two-point charges are placed 0.30 m apart. The first charge Q₁ = +4 × 10⁻⁶ C and the second charge Q₂ = -2 × 10⁻⁶ C. The Coulomb’s constant k = 9 × 10⁹ N·m²/C².
a) Find the electric field strength at the midpoint between the two charges (0.15 m from Q₁)?
b) If a small test charge q₀ = +1 × 10⁻⁸ C is placed at the midpoint, what electric force will act on it ?
Q29)
Q29) A hospital defibrillator uses a 32 μF capacitor that is charged to 750 V to deliver electrical energy to a patient. The patient’s body has a resistance of 50 Ω, and the shock lasts for 0.1 seconds.
a) How much electric charge is stored on the capacitor when fully charged?
b) Calculate the total energy stored in the capacitor?
c) What current flows through the patient’s body during the shock?
Q30)
Q30) A copper wire carries a current of 2.5 A for 30 sec. The wire has a resistance of 0.8 Ω.
a) How much total electric charge flows through the wire in 30 seconds?
b) What is the voltage across the wire?
c) What current flows through the patient’s body during the shock?
d) Find the magnetic flux passing through the coil using Φ = BA cos θ.
Q31)
Q31) A circular coil has a radius of 0.05 m and is placed in a magnetic field of strength 0.25 T. The magnetic field makes an angle of 30° with the normal to the coil surface.
a) Calculate the area of the circular coil?
b) Find the magnetic flux passing through the coil.
