Physics-
General
Easy
Question
A conductor ABOCD moves along its bisector with a velocity of 1 m/s through a perpendicular magnetic field of 1 wb/m2, as shown in fig. If all the four sides are of 1m length each, then the induced emf between points A and D is
- 0
- 1.41 volt
- 0.71 volt
- None of the above
The correct answer is: 1.41 volt
There is no induced emf in the part AB and CD because they are moving along their length while emf induced between B and C i.e. between A and D can be calculated as follows
Induced emf between B and C = Induced emf between A and B = 
Related Questions to study
physics-
A square metallic wire loop of side 0.1 m and resistance of 1W is moved with a constant velocity in a magnetic field of 2 wb/m2 as shown in figure. The magnetic field is perpendicular to the plane of the loop, loop is connected to a network of resistances. What should be the velocity of loop so as to have a steady current of 1mA in loop
A square metallic wire loop of side 0.1 m and resistance of 1W is moved with a constant velocity in a magnetic field of 2 wb/m2 as shown in figure. The magnetic field is perpendicular to the plane of the loop, loop is connected to a network of resistances. What should be the velocity of loop so as to have a steady current of 1mA in loop
physics-General
physics-
A conducting wire frame is placed in a magnetic field which is directed into the paper. The magnetic field is increasing at a constant rate. The directions of induced current in wires AB and CD are
A conducting wire frame is placed in a magnetic field which is directed into the paper. The magnetic field is increasing at a constant rate. The directions of induced current in wires AB and CD are
physics-General
physics-
As shown in the figure a metal rod makes contact and complete the circuit. The circuit is perpendicular to the magnetic field with 
If the resistance is 
, force needed to move the rod as indicated with a constant speed of 
is
As shown in the figure a metal rod makes contact and complete the circuit. The circuit is perpendicular to the magnetic field with If the resistance is , force needed to move the rod as indicated with a constant speed of is
physics-General
physics-
As shown in the figure, P and Q are two coaxial conducting loops separated by some distance. When the switch S is closed, a clockwise current 
flows in P (as seen by E) and an induced current 
flows in Q. The switch remains closed for a long time. When S is opened, a current 
flows in Q. Then the directions of and (as seen by E) are
As shown in the figure, P and Q are two coaxial conducting loops separated by some distance. When the switch S is closed, a clockwise current flows in P (as seen by E) and an induced current flows in Q. The switch remains closed for a long time. When S is opened, a current flows in Q. Then the directions of and (as seen by E) are
physics-General
Maths-
A particle moves along a line by 
then S is decreasing when t 
A particle moves along a line by then S is decreasing when t
Maths-General
maths-
Assertion: f(x) = ln 
is an odd function.
Reason: Let f be a function with domain D such that
i) x D 
– x D
ii) f(–x) = – f(x) and
iii) f (0) = 0 or f (0) is not defined
Then the function f(x) is an odd function
Assertion: f(x) = ln is an odd function.
Reason: Let f be a function with domain D such that
i) x D – x D
ii) f(–x) = – f(x) and
iii) f (0) = 0 or f (0) is not defined
Then the function f(x) is an odd function
maths-General
physics-
A conducting rod of length 2l is rotating with constant angular speed w about its perpendicular bisector. A uniform magnetic field 
exists parallel to the axis of rotation. The e.m.f. induced between two ends of the rod is
A conducting rod of length 2l is rotating with constant angular speed w about its perpendicular bisector. A uniform magnetic field exists parallel to the axis of rotation. The e.m.f. induced between two ends of the rod is
physics-General
physics-
A metallic square loop ABCD is moving in its own plane with velocity v in a uniform magnetic field perpendicular to its plane as shown in the figure. An electric field is induced
A metallic square loop ABCD is moving in its own plane with velocity v in a uniform magnetic field perpendicular to its plane as shown in the figure. An electric field is induced
physics-General
physics-
Two circular coils can be arranged in any of the three situations shown in the figure. Their mutual inductance will be
Two circular coils can be arranged in any of the three situations shown in the figure. Their mutual inductance will be
physics-General
physics-
A uniform but time-varying magnetic field B(t) exists in a circular region of radius a and is directed into the plane of the paper, as shown. The magnitude of the induced electric field at point P at a distance r from the centre of the circular region
A uniform but time-varying magnetic field B(t) exists in a circular region of radius a and is directed into the plane of the paper, as shown. The magnitude of the induced electric field at point P at a distance r from the centre of the circular region
physics-General
maths-
With the usual meaning for a, b, c and s if 
be the area of a triangle then the error in resulting from a small error in the measurement of c, is
With the usual meaning for a, b, c and s if be the area of a triangle then the error in resulting from a small error in the measurement of c, is
maths-General
physics-
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
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
physics-General
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
