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General
Easy
Question
A square loop ABCD, carrying a current i, is placed near and coplanar with a long straight conductor XY carrying a current I, the net force on the loop will be
The correct answer is:
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In the figure shown a current I1 is established in the long straight wire AB. Another wire CD carrying current I2 is placed in the plane of the paper. The line joining the ends of this wire is perpendicular to the wire AB. The force on the wire CD is:
In the figure shown a current I1 is established in the long straight wire AB. Another wire CD carrying current I2 is placed in the plane of the paper. The line joining the ends of this wire is perpendicular to the wire AB. The force on the wire CD is:
physics-General
physics-
A circular current loop of radius a is placed in a radial field B as shown. The net force acting on the loop is
A circular current loop of radius a is placed in a radial field B as shown. The net force acting on the loop is
physics-General
Physics-
A semi circular current carrying wire having radius R is placed in x-y plane with its centre at origin ‘O’. There is non-uniform magnetic field 
(here Bo is +ve constant) is existing in the region. The magnetic force acting on semi circular wire will be along
A semi circular current carrying wire having radius R is placed in x-y plane with its centre at origin ‘O’. There is non-uniform magnetic field (here Bo is +ve constant) is existing in the region. The magnetic force acting on semi circular wire will be along
Physics-General
physics-
A conducting wire bent in the form of a parabola y2 = 2x carries a current i = 2 A as shown in figure. This wire is placed in a uniform magnetic field 
Tesla. The magnetic force on the wire is (in newton)
A conducting wire bent in the form of a parabola y2 = 2x carries a current i = 2 A as shown in figure. This wire is placed in a uniform magnetic field Tesla. The magnetic force on the wire is (in newton)
physics-General
physics-
A straight rod of mass m and length L is suspended from the identical spring as shown in the figure. The spring stretched by a distance of x0 due to the weight of the wire. The circuit has total resistance RW. When the magnetic field perpendicular to the plane of the paper is switched on, springs are observed to extend further by the same distance. The magnetic field strength is
A straight rod of mass m and length L is suspended from the identical spring as shown in the figure. The spring stretched by a distance of x0 due to the weight of the wire. The circuit has total resistance RW. When the magnetic field perpendicular to the plane of the paper is switched on, springs are observed to extend further by the same distance. The magnetic field strength is
physics-General
physics-
A charged particle enters a uniform magnetic field perpendicular to its initial direction travelling in air. The path of the particle is seen to follow the path in figure. Which of statements 1–3 is/are correct? [1] The magnetic field strength may have been increased while the particle was travelling in air [2] The particle lost energy by ionising the air [3] The particle lost charge by ionising the air
A charged particle enters a uniform magnetic field perpendicular to its initial direction travelling in air. The path of the particle is seen to follow the path in figure. Which of statements 1–3 is/are correct? [1] The magnetic field strength may have been increased while the particle was travelling in air [2] The particle lost energy by ionising the air [3] The particle lost charge by ionising the air
physics-General
physics-
A particle moving with velocity v having specific charge (q/m) enters a region of magnetic field B having width 
at angle 53° to the boundary of magnetic field. Find the angle 
in the diagram.
A particle moving with velocity v having specific charge (q/m) enters a region of magnetic field B having width at angle 53° to the boundary of magnetic field. Find the angle in the diagram.
physics-General
physics-
A block of mass m & charge q is released on a long smooth inclined plane magnetic field B is constant, uniform, horizontal and parallel to surface as shown. Find the time from start when block loses contact with the surface.
A block of mass m & charge q is released on a long smooth inclined plane magnetic field B is constant, uniform, horizontal and parallel to surface as shown. Find the time from start when block loses contact with the surface.
physics-General
physics-
A particle having charge q enters a region of uniform magnetic field 
(directed inwards) and is deflected a distance x after travelling a distance y. The magnitude of the momentum of the particle is:
A particle having charge q enters a region of uniform magnetic field (directed inwards) and is deflected a distance x after travelling a distance y. The magnitude of the momentum of the particle is:
physics-General
physics-
The direction of magnetic force on the electron as shown in the diagram is along
The direction of magnetic force on the electron as shown in the diagram is along
physics-General
physics-
A particle with charge +Q and mass m enters a magnetic field of magnitude B, existing only to the right of the boundary YZ. The direction of the motion of the particle is perpendicular to the direction of B. Let 
The time spent by the particle in the field will be
A particle with charge +Q and mass m enters a magnetic field of magnitude B, existing only to the right of the boundary YZ. The direction of the motion of the particle is perpendicular to the direction of B. Let The time spent by the particle in the field will be
physics-General
Physics-
Two waves of lengths 50 cm and 51 cm produced 12 beats per second The velocity of sound is
Two waves of lengths 50 cm and 51 cm produced 12 beats per second The velocity of sound is
Physics-General
Physics-
The wave equation is y = 0.30 sin (314 t -1.57 x) where t, x and y are in second, meter and centimeter respectively The speed of the wave is
The wave equation is y = 0.30 sin (314 t -1.57 x) where t, x and y are in second, meter and centimeter respectively The speed of the wave is
Physics-General
Physics-
The equation of a plane progressive wave is given by y = 0.025 sin (100t + 0.25x) The frequency of this wave would be
The equation of a plane progressive wave is given by y = 0.025 sin (100t + 0.25x) The frequency of this wave would be
Physics-General
Physics-
What is the phase difference between two successive crests in the wave
What is the phase difference between two successive crests in the wave
Physics-General
