Physics-
General
Easy
Question
In a region of space, a uniform magnetic field B exists in the y–direction. A proton is fired from the origin, with its initial velocity v making a small angle a with the y–direction in the yz plane. In the subsequent motion of the proton
- its x–coordinate can never be positive
- its x– and z–coordinates cannot both be zero at the same time
- its z–coordinate can never be negative
- its y–coordinate will be proportional to the square of its time of flight
The correct answer is: its x–coordinate can never be positive
Related Questions to study
chemistry-
Identify A and B in the reaction gives below 
Identify A and B in the reaction gives below
chemistry-General
physics-
A thin non conducting disc of radius R is rotating clockwise (see figure) with an angular velocity w about its central axis, which is perpendicular to its plane. Both its surfaces carry
charges of uniform surface density. Half the disc is in a region of a uniform, unidirectional magnetic field B parallel to the plane of the disc, as shown. Then,
A thin non conducting disc of radius R is rotating clockwise (see figure) with an angular velocity w about its central axis, which is perpendicular to its plane. Both its surfaces carry charges of uniform surface density. Half the disc is in a region of a uniform, unidirectional magnetic field B parallel to the plane of the disc, as shown. Then,
physics-General
chemistry-
The compound B is
The compound B is
chemistry-General
chemistry-
In the above reaction sequence, X is
In the above reaction sequence, X is
chemistry-General
chemistry-
Which of the following reagents cannot be used for converting 
?
Which of the following reagents cannot be used for converting ?
chemistry-General
physics-
In the figure shown a coil of single turn is wound on a sphere of radius R and mass m. The plane of the coil is parallel to the plane and lies in the equatorial plane of the sphere. Current in the coil is i. The value of B if the sphere is in equilibrium is
In the figure shown a coil of single turn is wound on a sphere of radius R and mass m. The plane of the coil is parallel to the plane and lies in the equatorial plane of the sphere. Current in the coil is i. The value of B if the sphere is in equilibrium is
physics-General
physics-
OABC is a current carrying square loop. An electron is projected from the centre of loop along its diagonal AC as shown. Unit vector in the direction of initial acceleration will be
OABC is a current carrying square loop. An electron is projected from the centre of loop along its diagonal AC as shown. Unit vector in the direction of initial acceleration will be
physics-General
physics-
Two long conductors are arranged as shown above to form overlapping cylinders, each of radius r, whose centers are separated by a distance d Current of density J flows into the plane of the page along the shaded part of one conductor and an equal current flow out of the plane of the page along the shaded portion of the other, as shown. What are the magnitude and direction of the magnetic field at point A?
Two long conductors are arranged as shown above to form overlapping cylinders, each of radius r, whose centers are separated by a distance d Current of density J flows into the plane of the page along the shaded part of one conductor and an equal current flow out of the plane of the page along the shaded portion of the other, as shown. What are the magnitude and direction of the magnetic field at point A?
physics-General
physics-
A charge particle of charge q, mass m is moving with initial velocity 'v' as shown in figure in a uniform magnetic field 
Select the correct alternative/alternatives
A charge particle of charge q, mass m is moving with initial velocity 'v' as shown in figure in a uniform magnetic field Select the correct alternative/alternatives
physics-General
physics-
A particle of charge 'q' and mass 'm' enters normally (at point P) in a region of magnetic field with speed v. It comes out normally from Q after time T as shown in figure. The magnetic field B is present only in the region of radius R and is uniform. Initial and final velocities are along radial direction and they are perpendicular to each other. For this to happen, which of the following expression(S) is are correct–
A particle of charge 'q' and mass 'm' enters normally (at point P) in a region of magnetic field with speed v. It comes out normally from Q after time T as shown in figure. The magnetic field B is present only in the region of radius R and is uniform. Initial and final velocities are along radial direction and they are perpendicular to each other. For this to happen, which of the following expression(S) is are correct–
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 
. 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 . If mass of particle is 1 kg, then co–ordinates of centre of circle in which particle moves are
physics-General
chemistry-
Which reducing agents of the following can be used for the following transformation?
a) CH3 - CH = CH.COOH → CH3CH = CH. CH2OH
Which reducing agents of the following can be used for the following transformation?
a) CH3 - CH = CH.COOH → CH3CH = CH. CH2OH
chemistry-General
chemistry-
chemistry-General
chemistry-
In the reaction, X is 
In the reaction, X is
chemistry-General
physics-
In a region magnetic field along x axis changes with time according to the given graph. If time period, pitch and radius of helix path are T0, P0 and R respectively then which of the following is incorrect if the particle is projected at an angle q0 with the positive x–axis in x–y plane ?
In a region magnetic field along x axis changes with time according to the given graph. If time period, pitch and radius of helix path are T0, P0 and R respectively then which of the following is incorrect if the particle is projected at an angle q0 with the positive x–axis in x–y plane ?
physics-General
