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General
Easy
Question
When a ‘J’ shaped conducting rod is rotating in its own plane with constant angular velocity w, about one of its end P, in a uniform magnetic field 
directed normally into the plane of paper) then magnitude of emf induced across it will be
The correct answer is:
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In the circuit shown in figure, a conducting wire HE is moved with a constant speed V towards left. The complete circuit is placed in a uniform magnetic field perpendicular to the plane of the circuit directed in inward direction. The current in HKDE is
In the circuit shown in figure, a conducting wire HE is moved with a constant speed V towards left. The complete circuit is placed in a uniform magnetic field perpendicular to the plane of the circuit directed in inward direction. The current in HKDE is
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An equilateral triangular loop ADC of some finite magnetic field as shown in the figure. At time t = 0, side DC of loop is at edge of the magnetic field. Magnetic field is perpendicular to the paper inwards (or perpendicular to the plane of the coil). The induced current versus time graph will be as
An equilateral triangular loop ADC of some finite magnetic field as shown in the figure. At time t = 0, side DC of loop is at edge of the magnetic field. Magnetic field is perpendicular to the paper inwards (or perpendicular to the plane of the coil). The induced current versus time graph will be as
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A conducting rod PQ of length 5 m oriented as shown in figure is moving with velocity 
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Tesla. Emf induced in the rod is
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There is a uniform magnetic field B normal to the xy plane. A conductor ABC has length 
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The potential difference between A and C is proportional to
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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
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
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A conducting rod of length l moves with velocity 
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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.
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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.
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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
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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
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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.
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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
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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
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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:
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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 ?
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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.
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