Physics-
General
Easy
Question
Four equal positive charges are fixed at the vertices of a square of side L. Z-axis is perpendicular to the plane of the square. The point z=0 is the point where the diagonals of the square intersect each other. The plot of electric field due to the four charges, as one moves on the z-axis.
The correct answer is:
Related Questions to study
physics-
Two very long straight parallel wires, parallel to y-axis, carry currents 4I and I, along +y direction and -y direction, respectively. The wires pass through the x-axis at the points (d,0,0) and (-d,0,0) respectively. The graph of magnetic field z-component as one moves along the 
-axis from x=-d to x=+d, is best given by
Two very long straight parallel wires, parallel to y-axis, carry currents 4I and I, along +y direction and -y direction, respectively. The wires pass through the x-axis at the points (d,0,0) and (-d,0,0) respectively. The graph of magnetic field z-component as one moves along the -axis from x=-d to x=+d, is best given by
physics-General
physics-
A thin, straight conductor lies along the axis of a hollow conductor of radius R. The two carry equal currents in the same direction. The magnetic field B is plotted against the distance r from the axis. Which of the following best represents the resulting curve?
A thin, straight conductor lies along the axis of a hollow conductor of radius R. The two carry equal currents in the same direction. The magnetic field B is plotted against the distance r from the axis. Which of the following best represents the resulting curve?
physics-General
physics-
Figure shows a long wire bent at the middle to form a right angle. The ratio of 
Figure shows a long wire bent at the middle to form a right angle. The ratio of
physics-General
physics-
Fig shows a coil bent with all edges of length 1 m and carrying a current of 1A. There exists in space a uniform magnetic field of 2 T in the positively y-direction. Find the torque on the loop
Fig shows a coil bent with all edges of length 1 m and carrying a current of 1A. There exists in space a uniform magnetic field of 2 T in the positively y-direction. Find the torque on the loop
physics-General
physics-
Figure shows a square current carrying loop ABCD of side 10 cm and current i=10 A. The magnetic moment 
of the loop is
Figure shows a square current carrying loop ABCD of side 10 cm and current i=10 A. The magnetic moment of the loop is
physics-General
physics-
A galvanometer has an internal resistance of 
and current required for full scale deflection is 1 mA. Find the series resistances required as shown in fig, to use it as a voltmeter with different ranges, as indicated in fig.
A galvanometer has an internal resistance of and current required for full scale deflection is 1 mA. Find the series resistances required as shown in fig, to use it as a voltmeter with different ranges, as indicated in fig.
physics-General
physics-
Two conductors 1-3-5 and 2-4-6 are connected at equal potentials on resistors 
and 
. if the switch S is closed. Will this lead to change in the reading of an ammeter.
Two conductors 1-3-5 and 2-4-6 are connected at equal potentials on resistors and . if the switch S is closed. Will this lead to change in the reading of an ammeter.
physics-General
physics-
A rectangular coil PQ has 2n turns, an area 2a and carries a current 2I, (refer figure). The plane of the coil is at 60° to a horizontal uniform magnetic field of flux density B. The torque on the coil due to magnetic force is
A rectangular coil PQ has 2n turns, an area 2a and carries a current 2I, (refer figure). The plane of the coil is at 60° to a horizontal uniform magnetic field of flux density B. The torque on the coil due to magnetic force is
physics-General
physics-
A small coil C with N=200 turns is mounted on one of a balance beam and introduced between the poles of an electro magnet as shown in fig. The cross-sectional area of the coil is 
, the length of the arm OA of the balance beam is l=30 cm. When there is no current in the coil the balance is in equilibrium. On passing a current I=22 mA through the coil the equilibrium is restored by putting the additional counterweight of mass 
on the balance pan. Find the magnetic induction at the spot where the coil is located.
A small coil C with N=200 turns is mounted on one of a balance beam and introduced between the poles of an electro magnet as shown in fig. The cross-sectional area of the coil is , the length of the arm OA of the balance beam is l=30 cm. When there is no current in the coil the balance is in equilibrium. On passing a current I=22 mA through the coil the equilibrium is restored by putting the additional counterweight of mass on the balance pan. Find the magnetic induction at the spot where the coil is located.
physics-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 
. 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 . The value of B if the sphere is in equilibrium is
physics-General
physics-
A thin uniform rod of mass and length l is in equilibrium as shown in figure. P is a pivot. When a current I flows along the rod, it rotates from its place about point P. Assume that there is no effect of current on the spring and the spring remains horizontal. Find the torque experienced by the rod about P and spring force, when the rod makes an angle q with the horizontal.
A thin uniform rod of mass and length l is in equilibrium as shown in figure. P is a pivot. When a current I flows along the rod, it rotates from its place about point P. Assume that there is no effect of current on the spring and the spring remains horizontal. Find the torque experienced by the rod about P and spring force, when the rod makes an angle q with the horizontal.
physics-General
physics-
A ring of mass m and radius r carrying current 
is lying in the x-y plane with centre at the origin. A uniform magnetic field of strength 
is applied in the region. If the ring can rotate about the axis AA in x-y plane only.
Find the force on the loo
A ring of mass m and radius r carrying current is lying in the x-y plane with centre at the origin. A uniform magnetic field of strength is applied in the region. If the ring can rotate about the axis AA in x-y plane only.
Find the force on the loo
physics-General
physics-
A ring of mass m and radius r carrying current is lying in the x-y plane with centre at the origin. A uniform magnetic field of strength is applied in the region. If the ring can rotate about the axis AA in x-y plane only.
Find the initial magnetic energy stored in the ring
A ring of mass m and radius r carrying current is lying in the x-y plane with centre at the origin. A uniform magnetic field of strength is applied in the region. If the ring can rotate about the axis AA in x-y plane only.
Find the initial magnetic energy stored in the ring
physics-General
physics-
A ring of mass m and radius r carrying current is lying in the x-y plane with centre at the origin. A uniform magnetic field of strength is applied in the region. If the ring can rotate about the axis AA in x-y plane only.
Find initial angular acceleration
A ring of mass m and radius r carrying current is lying in the x-y plane with centre at the origin. A uniform magnetic field of strength is applied in the region. If the ring can rotate about the axis AA in x-y plane only.
Find initial angular acceleration
physics-General
physics-
Three long wires of resistance in the ratio 3:4:5 are connected in parallel to each other as shown in figure If net force on middle wire is zero then 
will be
Three long wires of resistance in the ratio 3:4:5 are connected in parallel to each other as shown in figure If net force on middle wire is zero then will be
physics-General
