Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions)
In figure shows a rectangular block with dimensions x , 2 x and 4 x . Electrical contacts can be made to the block between opposite pairs of faces (for example, between the faces labelled A – A , B – B and C – C ). Between which two faces would the maximum electrical resistance be obtained ( A – A : Top and bottom faces, B – B : Left and right faces, C – C : Front and rear faces)
19
Sep
In figure shows a rectangular block with dimensions x , 2 x and 4 x . Electrical contacts can be made to the block between opposite pairs of faces (for example, between the faces labelled A – A , B – B and C – C ). Between which two faces would the maximum electrical [...]
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2 x and 4 x . Electrical contacts can be made to the block between opposite pairs of faces (for example ,
B - B : Left and right faces ,
B - B and C - C ). Between which two faces would the maximum electrical resistance be obtained ( A - A : Top and bottom faces ,
between the faces labelled A - A ,
C - C : Front and rear faces) ,
In figure shows a rectangular block with dimensions x ,
If the distance covered is zero, then displacement a. Must be zero b. May or may not be zero c. Cannot be zero d. depends upon the particle
19
Sep
If the distance covered is zero, then displacement a. Must be zero b. May or may not be zero c. Cannot be zero d. depends upon the particle If the distance covered is zero then displacement a. Must be zero b. May or may not be zero c. Cannot be zero d. depends upon the [...]
Following figure shows cross-section through three long conductors of the same length and material, with square cross-section of edge lengths as shown. Conductor B will snugly within conductor B. Relationship between their end to end resistance is
19
Sep
Following figure shows cross-section through three long conductors of the same length and material, with square cross-section of edge lengths as shown. Conductor B will snugly within conductor B. Relationship between their end to end resistance is Following figure shows cross-section through three long conductors of the same length and material with square cross-section of [...]
In order to quadruple the resistance of a uniform wire, a part of its length was uniformly stretched till the final length of the entire wire was 1.5 times the original length, the part of the wire was fraction equal to
19
Sep
In order to quadruple the resistance of a uniform wire, a part of its length was uniformly stretched till the final length of the entire wire was 1.5 times the original length, the part of the wire was fraction equal to a part of its length was uniformly stretched till the final length of the [...]
If the displacement of a particle is zero, the distance covered a. Must be zero b. May or may not be zero c. Cannot be zero d. Depends upon the particle
19
Sep
If the displacement of a particle is zero, the distance covered a. Must be zero b. May or may not be zero c. Cannot be zero d. Depends upon the particle If the displacement of a particle is zero the distance covered a. Must be zero b. May or may not be zero c. Cannot [...]
Length of a hallow tube is 5 m, its outer diameter is 10 cm and thickness of its wall is 5 mm. If resistivity of the material of the tube is 1.7 x 10^-8 ohm x m then resistance of tube will be
19
Sep
Length of a hallow tube is 5 m, its outer diameter is 10 cm and thickness of its wall is 5 mm. If resistivity of the material of the tube is 1.7 x 10^-8 ohm x m then resistance of tube will be its outer diameter is 10 cm and thickness of its wall is [...]
The resistance of a wire of iron is 10 ohm and temperature coefficient of resistivity is 5 × 10^−3/.∘C, At 20∘ C it carries 30 mA of current. Keeping constant potential difference between its ends. The temperature of the wire is raised to 120∘C. The current in mA that flows in the wire now is.
19
Sep
The resistance of a wire of iron is 10 ohm and temperature coefficient of resistivity is 5 × 10^−3/.∘C, At 20∘ C it carries 30 mA of current. Keeping constant potential difference between its ends. The temperature of the wire is raised to 120∘C. The current in mA that flows in the wire now is. [...]
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At 20∘ C it carries 30 mA of current. Keeping constant potential difference between its ends. The temperature of the wire is raised to 120∘C. The current in mA that flows in the wire now is. ,
The resistance of a wire of iron is 10 ohm and temperature coefficient of resistivity is 5 × 10^−3/.∘C ,
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 [...]