List of top Physics Questions on Combination of Resistors - Series and Parallel asked in NEET (UG)

Consider two circuits, (A) and (B), each having two resistors. One of them has a positive temperature coefficient of resistance, \(+\alpha\), while the other one has a negative temperature coefficient of resistance, \(-\alpha\), as shown in the figure. The current through these circuits are denoted by \(I_A\) and \(I_B\). At initial temperature, the resistance of the two resistors is \(R_0\). As the temperature is increased, the correct option that describes the variation of current in these circuits is:

एक एकसमान धात्विक तार, जिसका प्रतिरोध 4Ω है, को एक वर्गाकार लूप (ABCD) (चित्र देखें) के रूप में मोड़ा गया। एक 2Ω का प्रतिरोध बिंदुओं B और D के बीच जोड़ा गया और एक 2 V की बैटरी को बिंदुओं A और C के आरपार जोड़ा गया जैसा कि चित्र में दिखाया गया है। अब धारा (I) का मान है: 
 

A carbon resistor of (47 ± 4.7) kΩ is to be marked with rings of different colours for its identification. The colour code sequence will be
The electrostatic force between the metal plates of an isolated parallel plate capacitor C having a charge Q and area A, is