4.2 Electrical Quantities
1. This question has 2 part(s).
1.1. A student rubs a polythene rod with a dry cloth. The polythene rod becomes negatively charged.
Describe and explain how the rod becomes negatively charged.
1.2. The negatively charged polythene rod hangs from a nylon thread so that it is free to turn.
The student charges a second polythene rod and brings it close to the first rod, as shown in Fig.11.1.
Describe and explain what happens when the negatively charged rods are close to each other.
Ai এর মাধ্যমে
১০ লক্ষ+ প্রশ্ন ডাটাবেজ
প্র্যাকটিস এর মাধ্যমে নিজেকে তৈরি করে ফেলো
উত্তর দিবে তোমার বই থেকে ও তোমার মত করে।
সারা দেশের শিক্ষার্থীদের মধ্যে নিজের অবস্থান যাচাই
The p.d. across the LED when lit is 3.1 V and the current in the LED is 0.030 A.
Calculate the value of the resistance of the LED when lit.
resistance = .........................................................
This question has 3 part(s).
Fig. 8.1 shows a power supply of e.m.f. 10.5 V connected in series with a lamp and a heater.
The p.d. across the lamp is 2.1 V and the current in the lamp is 1.5 A.
Calculate:
(i) the resistance of the heater
resistance = ......................................................... [2]
(ii) the power of the heater.
power = ......................................................... [2]
