Physics-
General
Easy
Question
A rod closing the circuit shown in figure moves along a U shaped wire at a constant speed v under the action of the force F. The circuit is in a uniform magnetic field perpendicular to the plane. Calculate F if the rate of heat generation in the circuit is Q
The correct answer is:
Related Questions to study
physics-
A conducting rod of length l moves with velocity 
a direction parallel to a long wire carrying a steady current I. The axis of the rod is maintained perpendicular to the wire with near end a distance r away as shown in the fig. Find the emf induced in the rod.
A conducting rod of length l moves with velocity a direction parallel to a long wire carrying a steady current I. The axis of the rod is maintained perpendicular to the wire with near end a distance r away as shown in the fig. Find the emf induced in the rod.
physics-General
physics-
A conducting rod moves with constant velocity u perpendicular to the long, straight wire carrying a current I as shown compute that the emf generated between the ends of the rod.
A conducting rod moves with constant velocity u perpendicular to the long, straight wire carrying a current I as shown compute that the emf generated between the ends of the rod.
physics-General
physics-
Two conducting rings P and Q of radii r and 2r rotate uniformly in opposite directions with centre of mass velocities 2v and v respectively on a conducting surface S. There is a uniform magnetic field of magnitude B perpendicular to the plane of the rings. The potential difference between the highest points of the two rings is
Two conducting rings P and Q of radii r and 2r rotate uniformly in opposite directions with centre of mass velocities 2v and v respectively on a conducting surface S. There is a uniform magnetic field of magnitude B perpendicular to the plane of the rings. The potential difference between the highest points of the two rings is
physics-General
physics-
A square metal loop of side 10 cm and resistance 1 
is moved with a constant velocity partly inside a magnetic field of 2 Wb m–2, directed into the paper, as shown in the figure. This loop is connected to a network of five resistors each of value 3 . If a steady current of 1 mA flows in the loop, then the speed of the loop is
A square metal loop of side 10 cm and resistance 1 is moved with a constant velocity partly inside a magnetic field of 2 Wb m–2, directed into the paper, as shown in the figure. This loop is connected to a network of five resistors each of value 3 . If a steady current of 1 mA flows in the loop, then the speed of the loop is
physics-General
physics-
The figure shows an isosceles triangle wire frame with apex angle equal to 
. The frame starts entering into the region of uniform magnetic field B with constant velocity v at t= 0. The longest side of the frame is perpendicular to the direction of velocity. If i is the instantaneous current through the frame then choose the alternative showing the correct variation of i with time.
The figure shows an isosceles triangle wire frame with apex angle equal to . The frame starts entering into the region of uniform magnetic field B with constant velocity v at t= 0. The longest side of the frame is perpendicular to the direction of velocity. If i is the instantaneous current through the frame then choose the alternative showing the correct variation of i with time.
physics-General
physics-
Two identical conductors P and Q are placed on two frictionless rails R and S in a uniform magnetic field directed into the plane. If P is moved in the direction shown in figure with a constant speed then rod Q
Two identical conductors P and Q are placed on two frictionless rails R and S in a uniform magnetic field directed into the plane. If P is moved in the direction shown in figure with a constant speed then rod Q
physics-General
physics-
Two infinitely long conducting parallel rails are connected through a capacitor C as shown in the figure. A conductor of length l is moved with constant speed
Two infinitely long conducting parallel rails are connected through a capacitor C as shown in the figure. A conductor of length l is moved with constant speed
physics-General
physics-
A negative charge is given to a nonconducting loop and the loop is rotated in the plane of paper about its centre as shown in figure. The magnetic field produced by the ring affects a small magnet placed above the ring in the same plane:
A negative charge is given to a nonconducting loop and the loop is rotated in the plane of paper about its centre as shown in figure. The magnetic field produced by the ring affects a small magnet placed above the ring in the same plane:
physics-General
physics-
Figure shows a bar magnet and a long straight wire W, carrying current into the plane of paper. Point P is the point of intersection of axis of magnet and the line of shortest distance between magnet and the wire. If P is the midpoint of the magnet, then which of the following statements is correct ?
Figure shows a bar magnet and a long straight wire W, carrying current into the plane of paper. Point P is the point of intersection of axis of magnet and the line of shortest distance between magnet and the wire. If P is the midpoint of the magnet, then which of the following statements is correct ?
physics-General
physics-
An electric current 
can flow either direction through loop (1) and induced current 
n loop (2). Positive i1 is when current is from 'a' to 'b' in loop (1) and positive is when the current is from 'c' to 'd' in loop (2) In an experiment, the graph of against time 't' is as shown below
Which one(s) of the following graphs could have caused to behave as give above.
An electric current can flow either direction through loop (1) and induced current n loop (2). Positive i1 is when current is from 'a' to 'b' in loop (1) and positive is when the current is from 'c' to 'd' in loop (2) In an experiment, the graph of against time 't' is as shown below
Which one(s) of the following graphs could have caused to behave as give above.
physics-General
physics-
In the arrangement shown in given figure current from A to B is increasing in magnitude. Induced current in the loop will
In the arrangement shown in given figure current from A to B is increasing in magnitude. Induced current in the loop will
physics-General
physics-
A vertical bar magnet is dropped from position on the axis of a fixed metallic coil as shown in fig - I. In fig - II the magnet is fixed and horizontal coil is dropped. The acceleration of the magnet and coil are 
respectively
A vertical bar magnet is dropped from position on the axis of a fixed metallic coil as shown in fig - I. In fig - II the magnet is fixed and horizontal coil is dropped. The acceleration of the magnet and coil are respectively
physics-General
physics-
A square coil ABCD is placed in x-y plane with its centre at origin. A long straight wire, passing through origin, carries a current in negative z-direction. Current in this wire increases with time. The induced current in the coil is :
A square coil ABCD is placed in x-y plane with its centre at origin. A long straight wire, passing through origin, carries a current in negative z-direction. Current in this wire increases with time. The induced current in the coil is :
physics-General
physics-
A rectangular loop with a sliding connector of length 10 cm is situated in uniform magnetic field perpendicular to plane of loop. The magnetic induction is 0.1 tesla and resistance of connector (R) is 1 ohm. The sides AB and CD have resistances 2 ohm and 3 ohm respectively. Find the current in the connector during its motion with constant velocity one metre/sec.
A rectangular loop with a sliding connector of length 10 cm is situated in uniform magnetic field perpendicular to plane of loop. The magnetic induction is 0.1 tesla and resistance of connector (R) is 1 ohm. The sides AB and CD have resistances 2 ohm and 3 ohm respectively. Find the current in the connector during its motion with constant velocity one metre/sec.
physics-General
physics-
A long straight wire is parallel to one edge as in fig. If the current in the long wire is varies in time as 
what will be the induced emf in the loop?
A long straight wire is parallel to one edge as in fig. If the current in the long wire is varies in time as what will be the induced emf in the loop?
physics-General
