4.2 Electrical Quantities
1. A student wants to charge up some rods by rubbing them with a cloth made from a suitable material.
He has a number of rods to choose from: a copper rod, a PVC rod, an aluminium rod and a glass rod.
Which two of the rods would hold a charge when rubbed with an appropriate cloth?
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]
