An electrostatic demonstration apparatus has a metal sphere that becomes negatively charged.
Complete the sentence about the apparatus. Choose the correct word from the box:
negative∣neutral∣positive \text{negative} \quad | \quad \text{neutral} \quad | \quad \text{positive} negative∣neutral∣positiveWhen a student touches the negatively charged metal sphere, the student's hair gains a ______________ charge.
Which of the following describes the direction of the electric field pattern around the negatively charged metal sphere?
The potential difference between the metal sphere and an earthed discharge plate is 350 000 V350\,000\text{ V}350000 V. When a spark jumps, there is a charge flow of 0.000 004 C0.000\,004\text{ C}0.000004 C.
Calculate the energy transferred by the spark. Use the equation:
energy transferred=charge flow×potential difference \text{energy transferred} = \text{charge flow} \times \text{potential difference} energy transferred=charge flow×potential difference