Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions)
All bulbs in figure are identical. which bulb lights more brightly ?
17
Nov
All bulbs in figure are identical. which bulb lights more brightly ? All bulbs in figure are identical. which bulb lights more brightly ? November 17, 2020 Category: Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) ,
Three identical cells , each having an emf1.5V and a constant internal resistance 2.0ω, are connected in series with a 4.0ωresis→rR, first as in circuit (i) , and second as in circuit (ii) . Then ( power in R in circuit (i))/( Power in R in circuit (ii)) =
15
Nov
Three identical cells , each having an emf1.5V and a constant internal resistance 2.0ω, are connected in series with a 4.0ωresis→rR, first as in circuit (i) , and second as in circuit (ii) . Then ( power in R in circuit (i))/( Power in R in circuit (ii)) = and second as in circuit (ii) [...]
The operating temperature of the filament of lamp is 2000∘C. The temperature coefficient of the material of the filament is 0.005∘C−1. If the atmospheric temperature is 0∘C, then the current in the 100 W−200 V lamp when it is switched on is nearest to
15
Nov
The operating temperature of the filament of lamp is 2000∘C. The temperature coefficient of the material of the filament is 0.005∘C−1. If the atmospheric temperature is 0∘C, then the current in the 100 W−200 V lamp when it is switched on is nearest to The operating temperature of the filament of lamp is 2000∘C. The [...]
A servo voltage stabiliser restricts the voltage output to 220V±1%. If an electric bulb rated at 220V,100W is connected to it, what will be the minimum and maximum power consumed by it?
15
Nov
A servo voltage stabiliser restricts the voltage output to 220V±1%. If an electric bulb rated at 220V,100W is connected to it, what will be the minimum and maximum power consumed by it? 100W is connected to it A servo voltage stabiliser restricts the voltage output to 220V±1%. If an electric bulb rated at 220V what [...]
An electric motor is designed to work at 100 V and draws a current of 6 A . The output power supplied by the motor is 150 W, and the remaining of the motor and its percentage efficiency?
15
Nov
An electric motor is designed to work at 100 V and draws a current of 6 A . The output power supplied by the motor is 150 W, and the remaining of the motor and its percentage efficiency? An electric motor is designed to work at 100 V and draws a current of 6 A [...]
The efficiency of a cell when connected to a resistance R is 60 % . what will be its efficiency if the externbal resistance is increased by six times ?
15
Nov
The efficiency of a cell when connected to a resistance R is 60 % . what will be its efficiency if the externbal resistance is increased by six times ? The efficiency of a cell when connected to a resistance R is 60 % . what will be its efficiency if the externbal resistance is [...]
The walls of a closed cubical box of edge 40 cm are made of a material of thickness 1 mm and thermal conductivity 4×10^−4 cal/s∘C−1. The interior of the box is maintained at 100∘C above the outside temperature by a heater placed inside the box and connected across 400 V dc . Calculate the resistance of the heater.
15
Nov
The walls of a closed cubical box of edge 40 cm are made of a material of thickness 1 mm and thermal conductivity 4×10^−4 cal/s∘C−1. The interior of the box is maintained at 100∘C above the outside temperature by a heater placed inside the box and connected across 400 V dc . Calculate the resistance [...]
A motor operating on 120 V draws a current of 2 A. If the heat is developed in the motor at the rate of 9 cal/s, what is its efficiency ?
15
Nov
A motor operating on 120 V draws a current of 2 A. If the heat is developed in the motor at the rate of 9 cal/s, what is its efficiency ? A motor operating on 120 V draws a current of 2 A. If the heat is developed in the motor at the rate of [...]
n identical bulbs are connected in series and illuminated by a power supply . One of the bulbs gets fused. The fused bulb is removed , and the remaining bulbs are again illuminated by the same power supply. Find the fractional change in the illuminated of (a) all the bulbs and (b) one bulb.
15
Nov
n identical bulbs are connected in series and illuminated by a power supply . One of the bulbs gets fused. The fused bulb is removed , and the remaining bulbs are again illuminated by the same power supply. Find the fractional change in the illuminated of (a) all the bulbs and (b) one bulb. and [...]
Two tungsten lamps with resistances R1andR2, respectively , are connected first in parallel and then in series in a lighting circuit of negligible internal resistance. Given R1>R2. (a) Which lamp will glow more brightly when they are connected in parallel ? (b) If the lamps of resistance R1 now burns out, how will the net illumination produced change ? (c ) Which lamp will glow more brightly when they are connected in series ? (d) If the lamp of resistance R2 now burns out and lamp R1 alone is plugged in , will the net illumination increase or decrease ?
15
Nov
Two tungsten lamps with resistances R1andR2, respectively , are connected first in parallel and then in series in a lighting circuit of negligible internal resistance. Given R1>R2. (a) Which lamp will glow more brightly when they are connected in parallel ? (b) If the lamps of resistance R1 now burns out, how will the net [...]