Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions)
A common flashlight bulb is rated 0.30 A and 2.7 V (the values of the current and voltage under operating conditions.) If the resistance of the tungsten bulb filament at room temperature 20∘ C is 1.0 Ω and its temperature coefficient of resistivity is 4.0 × 10^−3 C^−1, then find the temperature in centigrade of the filament when the bulb is on. (Consider the variation of resistance to be linear with temperature.)
19
Sep
A common flashlight bulb is rated 0.30 A and 2.7 V (the values of the current and voltage under operating conditions.) If the resistance of the tungsten bulb filament at room temperature 20∘ C is 1.0 Ω and its temperature coefficient of resistivity is 4.0 × 10^−3 C^−1, then find the temperature in centigrade of [...]
Two wires of resistance R1 and R2 have temperature coefficient of resistance α1 and α2 respectively. These are joined in series. The effective temperature coefficient of resistance is
19
Sep
Two wires of resistance R1 and R2 have temperature coefficient of resistance α1 and α2 respectively. These are joined in series. The effective temperature coefficient of resistance is Two wires of resistance R1 and R2 have temperature coefficient of resistance α1 and α2 respectively. These are joined in series. The effective temperature coefficient of resistance [...]
A cylindrical solid of length L and radius a is connected across a source of emf V and negligible internal resistance shown in figure. The resistivity of the rod at point P at a distance x from left end is given by ρ = bx ( where b is a positive constant ). Find the electric field at point P.
19
Sep
A cylindrical solid of length L and radius a is connected across a source of emf V and negligible internal resistance shown in figure. The resistivity of the rod at point P at a distance x from left end is given by ρ = bx ( where b is a positive constant ). Find the [...]
Temperature dependence of resistivity p(T) of semiconductors , insulators and metals is significantly based on the following factors
19
Sep
Temperature dependence of resistivity p(T) of semiconductors , insulators and metals is significantly based on the following factors insulators and metals is significantly based on the following factors Temperature dependence of resistivity p(T) of semiconductors September 19, 2020 Category: Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) ,
Which of the following characteristics of electrons determines the current in a conductor ?
19
Sep
Which of the following characteristics of electrons determines the current in a conductor ? Which of the following characteristics of electrons determines the current in a conductor ? September 19, 2020 Category: Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) ,
The length of the resistance wire is increased by 10%. what is the corresponding change in the resistance of wire ?
19
Sep
The length of the resistance wire is increased by 10%. what is the corresponding change in the resistance of wire ? The length of the resistance wire is increased by 10%. what is the corresponding change in the resistance of wire ? September 19, 2020 Category: Uncategorised (JEE Advanced Physics by BM Sharma + GMP [...]
A current I is passing through a wire having two sections P and O of uniform diameters d and d/2 respectively. If the mean drift velocity of electrons in section P and Q is denoted by vP and vQ respectively, then
19
Sep
A current I is passing through a wire having two sections P and O of uniform diameters d and d/2 respectively. If the mean drift velocity of electrons in section P and Q is denoted by vP and vQ respectively, then A steady current flows in a metallic conductor of non- uniform cross - section. [...]
A steady current flows in a metallic conductor of non- uniform cross – section. The quantity constant along the length of the conductor is /are
19
Sep
A steady current flows in a metallic conductor of non- uniform cross – section. The quantity constant along the length of the conductor is /are A steady current flows in a metallic conductor of non- uniform cross - section. The quantity constant along the length of the conductor is /are September 19, 2020 Category: Uncategorised [...]
In the above question, the resistance between the square faces is
19
Sep
In the above question, the resistance between the square faces is In the above question the resistance between the square faces is September 19, 2020 Category: Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) ,
Dimensions of a block are 1 cm x 1cm x 100 cm. If specific resistance of its material is 3 x 10 ^-7 ohm -m, then the resistance between the opposite rectangular faces is
19
Sep
Dimensions of a block are 1 cm x 1cm x 100 cm. If specific resistance of its material is 3 x 10 ^-7 ohm -m, then the resistance between the opposite rectangular faces is Dimensions of a block are 1 cm x 1cm x 100 cm. If specific resistance of its material is 3 x [...]