4.2 Electrical Quantities
1. A PVC (plastic) rod is rubbed with a nylon cloth. This process causes electrons to be transferred between the rod and the cloth, causing both objects to become charged.
Which of the rows in the table below correctly gives the nature of the charges on both the cloth and the rod, and the effect the objects have on each other after becoming charged?
Charges on rod and cloth | Effect | |
A | the same | repel |
B | the same | attract |
C | opposite | repel |
D | opposite | attract |
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]
