When question states that radius or diameter is increased by 3 times, that note that cross-sectional area does not increase by 3 times....

2019PPP1Q33 Ans: Option B 2007PPP1Q28 Ans: Option B Torch lamp or bulb is a non-ohmic conductor . The V-I graph has an increasing...

When comes to filament lamp, the non-ohmic characteristic properties comes to mind. But for this quesitons, you have to understand that...

Solutions: As the fuel level drops, the float which stays on the fuel surface will descend. The rod which is attached to the float will...

When two components are connected in series, where one is a fixed resistor and the resistance of the other can vary (e.g. thermistor,...

In general, assuming temperature of a conductor is constant, the resistance of a conductor is affected by 1) length (L) – [L increases, R...

Do you understand why there is a potential difference between P and Q? What if you are to find the potential difference between P and Q?...

Instead of the usual finding of potential difference across a component, in this question, you are required to find the p.d. across two...

For resistors connected in series, the total resistance is the sum of all resistance. Re = R1 + R2 + R3 For resistors in parallel, the...

Solutions: Option B Whatever that goes in has to come out. With this basic concept, you will be able to solve this question easily....

Sensitivity of the ammeter means that how small a current the ammeter can measure. Example, if the original set up is 0.2 A per division,...

Solutions: Option B As lamp X is thicker and shorter , these two factors make the resistance of X lower than Y . Recall: Length...

The concepts needed to solve such questions Length increases, resistance increases and vice versa. Finding resistors in parallel and in...