Question Answers
Sahay Sir > Question Answers
The current in conductor varies with time t as I = 2t + 3t^2 where I is in ampere and t in seconds. Electric charge flowing through a section of the conductor during t = 2 sec to t = 3 sec is
19
Sep
The current in conductor varies with time t as I = 2t + 3t^2 where I is in ampere and t in seconds. Electric charge flowing through a section of the conductor during t = 2 sec to t = 3 sec is The current in conductor varies with time t as I = 2t [...]
An ionization chamber with parallel conducting plates as anode and cathode has 5×10^7 electrons and the same number of singly-charged positive ions per cm^2. The electrons are moving at 0.4 m/s. The current density from anode to cathode is 4 μA/ m^2. The velocity of positive ions moving towards cathode is
19
Sep
An ionization chamber with parallel conducting plates as anode and cathode has 5×10^7 electrons and the same number of singly-charged positive ions per cm^2. The electrons are moving at 0.4 m/s. The current density from anode to cathode is 4 μA/ m^2. The velocity of positive ions moving towards cathode is A steady current flows [...]
Two resistance R1 and R2 are made of different material. The temperature coefficient of the material of R1 is α and of the material of R2 is −β. Then resistance of the series combination of R1 and R2 will not change with temperature, if R1/ R2 will not change with temperature if R1 / R2 equals
19
Sep
Two resistance R1 and R2 are made of different material. The temperature coefficient of the material of R1 is α and of the material of R2 is −β. Then resistance of the series combination of R1 and R2 will not change with temperature, if R1/ R2 will not change with temperature if R1 / R2 [...]
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) ,
Two wires of radii r and 2r respectively are welded together end to end. This combination is used as a sonometre wire kept under tension T. The welded point is midway between the two bridges. What would be the ratio of the number of loops formed in the wires such that the joint is a node when stationary vibrations are set up in the wires.-duplicate-2
19
Sep
Two wires of radii r and 2r respectively are welded together end to end. This combination is used as a sonometre wire kept under tension T. The welded point is midway between the two bridges. What would be the ratio of the number of loops formed in the wires such that the joint is a [...]
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 [...]