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what is Va – Vb in the arrangement shown in figure. what is the condition such that Va – Vb = 0.
01
Sep
what is Va – Vb in the arrangement shown in figure. what is the condition such that Va – Vb = 0. what is Va - Vb in the arrangement shown in figure. what is the condition such that Va - Vb = 0. September 1, 2020 Category: Uncategorised (JEE Advanced Physics by BM Sharma [...]
A body cools down from 60% = C to 55C in 30 s. Using newton’s law of cooling calculate the time takken by same body to cool down from 55C to 50C. Assume that the temperature of surrounding is 45C.
01
Sep
A body cools down from 60% = C to 55C in 30 s. Using newton’s law of cooling calculate the time takken by same body to cool down from 55C to 50C. Assume that the temperature of surrounding is 45C. A body cools down from 60% = C to 55C in 30 s. Using newton's [...]
Find the potential difference vab between a Va -Vb between the points (1) and (2) shown in each part of figure.
01
Sep
Find the potential difference vab between a Va -Vb between the points (1) and (2) shown in each part of figure. Find the potential difference vab between a Va -Vb between the points (1) and (2) shown in each part of figure. September 1, 2020 Category: Uncategorised (JEE Advanced Physics by BM Sharma + GMP [...]
Four capacitors of capacitance C, 2C , 3C & 4C respectively are connected as shown in figure.Battery is ideal and all the connected wires have no resistance capacitance of inductance.Initially the switch S is open.If at t=0 switch S is closed. Heat generated is the switch after closing switch is.
01
Sep
Four capacitors of capacitance C, 2C , 3C & 4C respectively are connected as shown in figure.Battery is ideal and all the connected wires have no resistance capacitance of inductance.Initially the switch S is open.If at t=0 switch S is closed. Heat generated is the switch after closing switch is. 2C A circuit has a [...]
Two solid copper spheres of radii r1 = 15cm and r2 = 20cm are both at a temperature of 60C. If the temperature of surrounding is 50C, then find a. The ratio of the heat loss per second from their surfaces initially. b. the ratio of rates of cooling initially.
01
Sep
Two solid copper spheres of radii r1 = 15cm and r2 = 20cm are both at a temperature of 60C. If the temperature of surrounding is 50C, then find a. The ratio of the heat loss per second from their surfaces initially. b. the ratio of rates of cooling initially. then find a. The ratio [...]
The emissivity of tungsten is aproximately 0.35. A tungsten sphere 1 cm in radius is suspended within a large evacuated enclosure whose walls are at 300 K. What power input is required to maintain the sphere at a temperature of 3000 K if heat conduction along the support
01
Sep
The emissivity of tungsten is aproximately 0.35. A tungsten sphere 1 cm in radius is suspended within a large evacuated enclosure whose walls are at 300 K. What power input is required to maintain the sphere at a temperature of 3000 K if heat conduction along the support A thin brass rectangular sheet of sides [...]
A thin brass rectangular sheet of sides 15.0 and 12.0 cm is heated in a furnace to 600C and taken out. How much electric power is needed to maintain the sheet at this temperature, given that its emissivity is 0.250?
01
Sep
A thin brass rectangular sheet of sides 15.0 and 12.0 cm is heated in a furnace to 600C and taken out. How much electric power is needed to maintain the sheet at this temperature, given that its emissivity is 0.250? A thin brass rectangular sheet of sides 15.0 and 12.0 cm is heated in a [...]
A circuit has a section Ab shown in fig. The emf of the source equals E = 10V, the capacitances are equal to C1=1.0μF and C2=2.0μF, and the potential difference φA−φB = 5.0V. Find the voltage across each capacitor.
01
Sep
A circuit has a section Ab shown in fig. The emf of the source equals E = 10V, the capacitances are equal to C1=1.0μF and C2=2.0μF, and the potential difference φA−φB = 5.0V. Find the voltage across each capacitor. A circuit has a section Ab shown in fig. The emf of the source equals E [...]
The operating temperature of an incandescent bulb (with a tungsten filament) of power 60 W is 3000 K. If the surface area of the filament be 25 mm^2, find its emissivity e.
01
Sep
The operating temperature of an incandescent bulb (with a tungsten filament) of power 60 W is 3000 K. If the surface area of the filament be 25 mm^2, find its emissivity e. find its emissivity e. The operating temperature of an incandescent bulb (with a tungsten filament) of power 60 W is 3000 K. If [...]
Three uncharged capacitors of capacities C1, C2 and C3 are connected as shown in the figure to one another and the potentials V1, V2 and V3 respectively. Then the potential at O will be
01
Sep
Three uncharged capacitors of capacities C1, C2 and C3 are connected as shown in the figure to one another and the potentials V1, V2 and V3 respectively. Then the potential at O will be C2 and C3 are connected as shown in the figure to one another and the potentials V1 Three uncharged capacitors of [...]