Physics-
General
Easy
Question
Consider the situation shown in the figure. The wire AB is sliding on the fixed rails with a constant velocity. If the wire AB is replaced by semicircular wire, the magnitude of the induced current will
- Increase
- Remain the same
- Decrease
- Increase or decrease depending on whether the semicircle bulges towards the resistance or away from it
The correct answer is: Remain the same
Effective length between A and B remains same
Related Questions to study
physics-
A thin semicircular conducting ring of radius R is falling with its plane vertical in a horizontal magnetic induction B. At the position MNQ, the speed of the ring is V and the potential difference developed across the ring is
A thin semicircular conducting ring of radius R is falling with its plane vertical in a horizontal magnetic induction B. At the position MNQ, the speed of the ring is V and the potential difference developed across the ring is
physics-General
physics-
An electron moves along the line AB, which lies in the same plane as a circular loop of conducting wires as shown in the diagram. What will be the direction of current induced if any, in the loop
An electron moves along the line AB, which lies in the same plane as a circular loop of conducting wires as shown in the diagram. What will be the direction of current induced if any, in the loop
physics-General
physics-
In the circuit shown switch k2 is open and switch k1 is closed at t = 0. At time t = to switch k1 is opened and switch k2 is simultaneously closed. The variation of inductor current with time is
In the circuit shown switch k2 is open and switch k1 is closed at t = 0. At time t = to switch k1 is opened and switch k2 is simultaneously closed. The variation of inductor current with time is
physics-General
physics-
An equilateral triangular loop having a resistance R and length of each side l is placed in a magnetic field which is varying at 
The induced current in the loop will be
An equilateral triangular loop having a resistance R and length of each side l is placed in a magnetic field which is varying at The induced current in the loop will be
physics-General
maths-
The area of the triangle formed by tangents drawn from the point (x1, y1) to the parabola y2 = 8x and its chord of contact is
The area of the triangle formed by tangents drawn from the point (x1, y1) to the parabola y2 = 8x and its chord of contact is
maths-General
physics-
A uniform but time varying magnetic field is present in a circular region of radius R. The magnetic field is perpendicular and into the plane of the loop and the magnitude of the field is increasing at a constant rate 
.There is a straight conducting rod of length 2R placed as shown in figure .The magnitude of induced emf across the rod is
A uniform but time varying magnetic field is present in a circular region of radius R. The magnetic field is perpendicular and into the plane of the loop and the magnitude of the field is increasing at a constant rate .There is a straight conducting rod of length 2R placed as shown in figure .The magnitude of induced emf across the rod is
physics-General
physics-
In the arrangement shown in the figure, uniform magnetic field B is upward to the plane of paper. Connecter AB is smooth and conducting, having mass m and length l. Initially spring has extension X0. Spring is non-conducting (neglect induction in spring). Connector is released at t = 0. Maximum charge on the capacitor is
In the arrangement shown in the figure, uniform magnetic field B is upward to the plane of paper. Connecter AB is smooth and conducting, having mass m and length l. Initially spring has extension X0. Spring is non-conducting (neglect induction in spring). Connector is released at t = 0. Maximum charge on the capacitor is
physics-General
physics-
Time constant of L-R circuit will be
Time constant of L-R circuit will be
physics-General
physics-
A large number of infinite long thin wires each carrying current i0 are kept along z-axis. Then the value of magnetic field ‘B’, at any point ‘P’ at a distance ‘x’ from O varies as
A large number of infinite long thin wires each carrying current i0 are kept along z-axis. Then the value of magnetic field ‘B’, at any point ‘P’ at a distance ‘x’ from O varies as
physics-General
physics-
Two fixed long conducting wires cross each other perpendicularly so that they do not actually touch but are close to each other as shown in the figure. Equal current i exist in each wire in the directions indicated. In what region(s) will there be some points with zero net magnetic field?
Two fixed long conducting wires cross each other perpendicularly so that they do not actually touch but are close to each other as shown in the figure. Equal current i exist in each wire in the directions indicated. In what region(s) will there be some points with zero net magnetic field?
physics-General
Maths-
Period of f (x) = sin x + tan 
+ sin 
+ tan 
+ ... + sin 
+ tan 
is -
Period of f (x) = sin x + tan + sin + tan + ... + sin + tan is -
Maths-General
physics-
A container is filled with water
up to a height of 33.25 cm. A concave mirror is placed 15 cm above the water level and the image of an object placed at the bottom is formed 25 cm below the water level. The focal length of the mirror is
A container is filled with water up to a height of 33.25 cm. A concave mirror is placed 15 cm above the water level and the image of an object placed at the bottom is formed 25 cm below the water level. The focal length of the mirror is
physics-General
biology
An organism is able to live on a culture medium containing nutrient A, by the enzyme catalysed reactinons 
A mutant failed to survive on this medium but grew when nutrient B was added to it. Which gene of this mutant was defective
An organism is able to live on a culture medium containing nutrient A, by the enzyme catalysed reactinons A mutant failed to survive on this medium but grew when nutrient B was added to it. Which gene of this mutant was defective
biologyGeneral
biology
DNA fragments separated by gel electrophoresis are shown. Mark the correct statement
DNA fragments separated by gel electrophoresis are shown. Mark the correct statement
biologyGeneral
biology
The basic procendure involved in the sythesis of recombinant DNA molecule is depicted. The mistake in the procedure is
The basic procendure involved in the sythesis of recombinant DNA molecule is depicted. The mistake in the procedure is
biologyGeneral
