- a. A plastic scale
- b. A copper rod
- c. An inflated balloon
- d. A woollen cloth
(b) A copper rod.
- a. and cloth both acquire positive charge
- b. becomes positively charged while cloth becomes negatively charged
- c. and cloth both acquire negative charge
- d. becomes negatively charged while cloth becomes positively charged
(b) becomes positively charged while the cloth becomes negatively charged.
(a) False (b) True, if oppositely charged (c) False (d) False.
Friction between sweater and body charges them. Discharge of these charges produces tiny sparks and crackling sound.
The human body conducts electricity, so charge flows through the body to the earth. This is earthing.
The Richter scale. A magnitude 3 earthquake is recorded by a seismograph but usually causes little or no damage.
Stay indoors or inside a closed vehicle, avoid open fields and tall trees, and do not use wired phones or touch electrical appliances during a thunderstorm.
Two similarly charged balloons repel. A charged balloon induces opposite charge on the nearer side of an uncharged balloon, causing attraction.
A simple electroscope has a metal rod with thin metal leaves. When a charged body touches or comes near the knob, charges spread to the leaves and they diverge, showing charge.
Jammu and Kashmir, Himachal Pradesh and Assam. Other examples include Uttarakhand and parts of Gujarat.
Move to an open area away from buildings, trees, electric poles and bridges. If in a vehicle, stop in a clear place and stay inside.
No. An umbrella with a metal rod can increase the risk of lightning strike in an open area.