Reference no: EM132535730

1. If a = 40 cm and b = 50 cm, q1 = - 4 nC and q2 = 1.5 nC, what is the magnitude of the electric field at point P?

2. A parallel plate capacitor has an area of 80cm2 and the capacitance of the capacitor is 9 pF. Determine the seperation between the plates of the capacitor.

3. 3,50 cm away from a particle with a charge of - 2.3 × 10-8 C. Find the potential energy of this two particle system.

4. A tungsten wire with a cross-sectional area of 0.150 has a resistance of 2Ω at 20?. The temperature coefficient of resistivity is given as = 45 × 10-4 (°C)-1 . When the temperature of this wire is increased to 70?, find the length of this wire. (Resistivity of the wire at 20? is 5.6 × 10-8 Ωm)