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If the length of the filament of a heater is reduced by 10 %, the power of the heater will
21
Sep
If the length of the filament of a heater is reduced by 10 %, the power of the heater will If the length of the filament of a heater is reduced by 10 % the power of the heater will September 21, 2020 Category: Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) ,
The three resistance A, B and C have values 3R, 6R and R respectively.When some potential difference is applied across the network,the thermal powers dissipated by A, B and C are in the ratio
21
Sep
The three resistance A, B and C have values 3R, 6R and R respectively.When some potential difference is applied across the network,the thermal powers dissipated by A, B and C are in the ratio 6R and R respectively.When some potential difference is applied across the network B and C are in the ratio B and [...]
Two identical electric lamps marked 500 W, 220 V are connected in series and then joined to a 110 V line. The power consumed by each lamp is
21
Sep
Two identical electric lamps marked 500 W, 220 V are connected in series and then joined to a 110 V line. The power consumed by each lamp is 220 V are connected in series and then joined to a 110 V line. The power consumed by each lamp is Two identical electric lamps marked 500 [...]
Battery shown in figure has e.m.f. `E` and internal resistance `r`. Current in the circuit can be varied by sliding the contact `J`. If at any instant current flowing through the circuit is `I`, potential difference between terminals of the cells is `V`, thermal power generated in the cell is equal to `eta` fraction of total electrical power generated in it, then which of the following graphs is correct ?
21
Sep
Battery shown in figure has e.m.f. `E` and internal resistance `r`. Current in the circuit can be varied by sliding the contact `J`. If at any instant current flowing through the circuit is `I`, potential difference between terminals of the cells is `V`, thermal power generated in the cell is equal to `eta` fraction of [...]
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Battery shown in figure has e.m.f. `E` and internal resistance `r`. Current in the circuit can be varied by sliding the contact `J`. If at any instant current flowing through the circuit is `I` ,
potential difference between terminals of the cells is `V` ,
then which of the following graphs is correct ? ,
thermal power generated in the cell is equal to `eta` fraction of total electrical power generated in it ,
(A) Consider circuit in figure. How much energy is absorbed by electrons from the initial state of no current (Ignore thermal motion) to the state of drift velocity? (b) electrons give up energy at the rate of RI2 per second tot he thermal energy. What time scale would number associate with energy in problem (a)? n= number of electron/volume = 10^29 m^3 length of circuit=10 cm, cross-section A=(1 mm )2
21
Sep
(A) Consider circuit in figure. How much energy is absorbed by electrons from the initial state of no current (Ignore thermal motion) to the state of drift velocity? (b) electrons give up energy at the rate of RI2 per second tot he thermal energy. What time scale would number associate with energy in problem (a)? [...]
If the cell of emf 5 volt shown in the figure gives a power of 10 W, find the powers consumed by the resistors 2 ohm and 1 ohm
21
Sep
If the cell of emf 5 volt shown in the figure gives a power of 10 W, find the powers consumed by the resistors 2 ohm and 1 ohm find the powers consumed by the resistors 2 ohm and 1 ohm If the cell of emf 5 volt shown in the figure gives a power [...]
Four identical electrical lamps are labelled 1.5 V 0.5 A which describes the condition necessary for them to operate at normal brightness. A 12 V battery of negligible internal resistance is connected to lamps as shown, then
21
Sep
Four identical electrical lamps are labelled 1.5 V 0.5 A which describes the condition necessary for them to operate at normal brightness. A 12 V battery of negligible internal resistance is connected to lamps as shown, then then Two bulbs X and Y having same voltage rating and of power 40 watt and 60 watt [...]
The resistance of a heater coil is 110 ohm. A resistance R is connected in parallel with it and the combination is joined in series with a resistance of 11ohm to a 220 volt main line. The heater operates with a power of 110 watt. The value of R in ohm is
21
Sep
The resistance of a heater coil is 110 ohm. A resistance R is connected in parallel with it and the combination is joined in series with a resistance of 11ohm to a 220 volt main line. The heater operates with a power of 110 watt. The value of R in ohm is then Two bulbs [...]
In the circuit as shown in the figure, the heat produced by 6 ohm due to current flowing in it is 60 calorie per second. The heat generated across 3 ohm resistance per second will be
21
Sep
In the circuit as shown in the figure, the heat produced by 6 ohm due to current flowing in it is 60 calorie per second. The heat generated across 3 ohm resistance per second will be In the circuit as shown in the figure the heat produced by 6 ohm due to current flowing in [...]
Water boils in an electric kettle in 15 minutes after switching on. If the lenght of the heating wire is decreased to 2/3 of its initial value, then the same amount of water will boil with the same supply voltage in
21
Sep
Water boils in an electric kettle in 15 minutes after switching on. If the lenght of the heating wire is decreased to 2/3 of its initial value, then the same amount of water will boil with the same supply voltage in then the same amount of water will boil with the same supply voltage in [...]