Ls 3 - Current Electricity
Last updated
Was this helpful?
Last updated
Was this helpful?
Constant voltage is applied between two ends of a metallic wire. If the length is halved and the radius of the wire is doubled, the rate of heat developed in the wire will be
Coefficient of linear expansion of material of resistor is alpha. Its temperature coefficient of resistivity and resistance are alpha (p) and alpha (R) respectively, then the relation between them is ?
Two particles X and Y having equal charges, after being accelerated through the same potential difference, enter a region of uniform magnetic field and describes circular path of radius R1 and R2 respectively. The ratio of mass of X to that of Y is
3 resistors having resistances r1, r2 and r3 are connected as shown in the given circuit. the ratio i3/il of currents in terms of resistances used in the circuit is
The charge flowing through a resistance R varies with time t as Q=at-bt^2 where a and b are positive constants. The total heat produced in R is
A potentiometer circuit has been set up for finding the internal resistance of a given cell. The main battery, used across the potentiometer wire, has an emf of 2.0 V and a negligible internal resistance. The potentiometer wire itself is 4m long. When the resistance R is connected across the given cell, has values of (i) infinity, (ii)9.5 ohm, the 'balancing lengths' on the potentiometer wire are found to be 3m and 2.85 m respectively. The value of internal resistance is?