Physics-
General
Easy
Question
A long straight wire, carrying current I, is bent at its midpoint to form an angle of 
Magnetic field at point P, distance R from point of bending is equal to :
The correct answer is:
Related Questions to study
physics-
Three infinite current carrying conductors are placed as shown in figure Two wires carry same current while current in third wire is unknown. The three wires do not intersect with each other and all of them are in the plane of paper. Which of the following is correct about a point 'P' which is also in the same plane :
Three infinite current carrying conductors are placed as shown in figure Two wires carry same current while current in third wire is unknown. The three wires do not intersect with each other and all of them are in the plane of paper. Which of the following is correct about a point 'P' which is also in the same plane :
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physics-
A uniform magnetic field of 1.5 T exists in a cylindrical region of radius 10.0 cm, its direction being parallel to the axis along east to west. A current carrying wire in north south direction passes through this region. The wire intersects the axis and experience a force of 1.2 N downward. (As shown in figure). If the wire is turned from North South to north east–southwest direction, then magnitude and direction of force is
A uniform magnetic field of 1.5 T exists in a cylindrical region of radius 10.0 cm, its direction being parallel to the axis along east to west. A current carrying wire in north south direction passes through this region. The wire intersects the axis and experience a force of 1.2 N downward. (As shown in figure). If the wire is turned from North South to north east–southwest direction, then magnitude and direction of force is
physics-General
physics-
A uniform, constant magnetic field 
is directed at an angle of to the x-axis in the xy-plane, PQRS is a rigid square wire frame carrying a steady current 
, with its centre at the origin O. At time t = 0, the frame is at rest in the position shown in the figure, with its sides parallel to the x and y axes. Each side of the frame is of mass M and length L.. The torque 
about O acting on the frame due to the magnetic field will be
A uniform, constant magnetic field is directed at an angle of to the x-axis in the xy-plane, PQRS is a rigid square wire frame carrying a steady current , with its centre at the origin O. At time t = 0, the frame is at rest in the position shown in the figure, with its sides parallel to the x and y axes. Each side of the frame is of mass M and length L.. The torque about O acting on the frame due to the magnetic field will be
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physics-
In the plane mirror, the co-ordinates of image of charged particle (initially at origin as shown) after two and half time periods are (initial velocity V0 is in the xy-plane and the plane mirror is perpendicular to the x-axis. A uniform magnetic field 
exists in the whole space. 
is pitch of helix, 
is radius of helix).
In the plane mirror, the co-ordinates of image of charged particle (initially at origin as shown) after two and half time periods are (initial velocity V0 is in the xy-plane and the plane mirror is perpendicular to the x-axis. A uniform magnetic field exists in the whole space. is pitch of helix, is radius of helix).
physics-General
physics-
A uniform magnetic field of magnitude 1 T exists in region 
is along 
direction as shown. A particle of charge 1 C is projected from point 
towards origin with speed 1 m/sec. If mass of particle is 1 kg, then co-ordinates of centre of circle in which particle moves are
A uniform magnetic field of magnitude 1 T exists in region is along direction as shown. A particle of charge 1 C is projected from point towards origin with speed 1 m/sec. If mass of particle is 1 kg, then co-ordinates of centre of circle in which particle moves are
physics-General
physics-
Figure shows an equilateral triangle ABC of side 
carrying currents, placed in uniform magnetic field B. The magnitude of magnetic force on triangle is
Figure shows an equilateral triangle ABC of side carrying currents, placed in uniform magnetic field B. The magnitude of magnetic force on triangle is
physics-General
physics-
If a charged particle of charge to mass ratio q/m = 
is entering in a uniform magnetic field of strength B which is extended up to 4d as shown in figure at a speed v = (2d)(B), then which of the following is correct :
If a charged particle of charge to mass ratio q/m = is entering in a uniform magnetic field of strength B which is extended up to 4d as shown in figure at a speed v = (2d)(B), then which of the following is correct :
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physics-
An electron moving with velocity V along the axis approaches a circular current carrying loop as shown in the figure. The magnitude of magnetic force on electron at this instant is
An electron moving with velocity V along the axis approaches a circular current carrying loop as shown in the figure. The magnitude of magnetic force on electron at this instant is
physics-General
physics-
A coaxial cable is made up of two conductors. The inner conductor is solid and is of radius R1 & the outer conductor is hollow of inner radius R2 and outer radius R3. The space between the conductors is filled with air. The inner and outer conductors are carrying currents of equal magnitudes and in opposite directions. Then the variation of magnetic field with distance from the axis is best plotted as:
A coaxial cable is made up of two conductors. The inner conductor is solid and is of radius R1 & the outer conductor is hollow of inner radius R2 and outer radius R3. The space between the conductors is filled with air. The inner and outer conductors are carrying currents of equal magnitudes and in opposite directions. Then the variation of magnetic field with distance from the axis is best plotted as:
physics-General
physics-
Figure shows an amperian path ABCDA. Part ABC is in vertical plane PSTU while part CDA is in horizontal plane PQRS. Direction of circulation along the path is shown by an arrow near point B and at 
for this path according to Ampere’s law will be :
Figure shows an amperian path ABCDA. Part ABC is in vertical plane PSTU while part CDA is in horizontal plane PQRS. Direction of circulation along the path is shown by an arrow near point B and at for this path according to Ampere’s law will be :
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physics-
A steady current is set up in a cubic network composed of wires of equal resistance and length d as shown in figure. What is the magnetic field at the centre of cube P due to the cubic network ?
A steady current is set up in a cubic network composed of wires of equal resistance and length d as shown in figure. What is the magnetic field at the centre of cube P due to the cubic network ?
physics-General
physics-
Two infinitely long linear conductors are arranged perpendicular to each other and are in mutually perpendicular planes as shown in figure. If 
along the y-axis and 
along negative z-axis and AP = AB = 1 cm. The value of magnetic field strength
Two infinitely long linear conductors are arranged perpendicular to each other and are in mutually perpendicular planes as shown in figure. If along the y-axis and along negative z-axis and AP = AB = 1 cm. The value of magnetic field strength
physics-General
physics-
An infinitely long wire carrying current I is along Y axis such that its one end is at point A (0, b) while the wire extends up to + 
. The magnitude of magnetic field strength at point (a, 0) is
An infinitely long wire carrying current I is along Y axis such that its one end is at point A (0, b) while the wire extends up to + . The magnitude of magnetic field strength at point (a, 0) is
physics-General
physics-
The magnetic field at the origin due to the current flowing in the wire as shown in figure below is
The magnetic field at the origin due to the current flowing in the wire as shown in figure below is
physics-General
physics-
If the magnetic field at 'P' in the given figure can be written as K tan 
then K is
If the magnetic field at 'P' in the given figure can be written as K tan then K is
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