EASY
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Helmholtz coil is used to produce uniform magnetic field between coils.
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Important Questions on Magnetic Effects of Electric Current
MEDIUM
A wire bent in the shape of a regular polygonal loop carries a steady current . Let be the perpendicular distance of a given segment and be the distance of a vertex both from the centre of the loop. The magnitude of the magnetic field at the centre of the loop is given by,
MEDIUM
Two infinitely long straight wires lie in the xy - plane along the lines . The wire located at carries a constant current and the wire located at carries a constant current . A circular loop of radius R is suspended with its centre at and in a plane parallel to the xy - plane. This loop carries a constant current in the clockwise direction as seen from above the loop. The current in the wire is taken to be positive if it is in the direction. Which of the following statements regarding the magnetic field is (are) true?
EASY
The magnitude of a magnetic field at the centre of a circular coil of radius , having turns and carrying a current can be doubled by changing
HARD
Two identical wires and , each of length , carry the same current . Wire is bent into a circle of radius and wire is bent to form a square of side . If and are the values of magnetic field at the centres of the circle and square respectively, then the ratio is
MEDIUM
Two long parallel wires placed apart, carry currents and in the same direction. What is the distance from the conductor carrying the larger current to the point where the resultant magnetic field is zero?
MEDIUM
A small current element of length and carrying current is placed at (1, 1, 0) and is carrying current in '+ z' direction. If magnetic field at origin be and at point (2, 2, 0) be then:
HARD
Two infinitely long parallel wires carry currents of magnitude and and are at a distance 4 cm apart. The magnitude of the net magnetic field is found to reach a non-zero minimum values between the two wires and 1 cm away from the first wire. The ratio of the two currents and their mutual direction is
MEDIUM
A thin ring of radius carries a uniformly distributed charge. The ring rotates at a constant angular speed of about its axis, perpendicular to its plane. Is the magnetic field its centre is , then the charge carried by the ring is close to
EASY
An electron moving in a circular orbit of radius makes rotations per second. The magnetic field produced at the center has magnitude:
EASY
A long wire carrying a steady current is bent into a circular loop of one turn. The magnetic field at the centre of the loop is It is then bent into a circular coil of turns. The magnetic field at the centre of this coil of turns will be
MEDIUM
A cylindrical conductor of radius is carrying a constant current. The plot of the magnitude of the magnetic field with the distance from the centre of the conductor is correctly represented by the figure.
MEDIUM
A long straight wire of radius carries a steady current . the current is uniformly distributed over its cross-section. The ratio of the magnetic fields and , at radial distances and respectively, from the axis of the wire is:
MEDIUM
Two very long, straight, and insulated wires are kept at angle from each other in plane as shown in the figure.
These wires carry currents of equal magnitude , whose direction are shown in the figure. The net magnetic field at point will be:
EASY
The magnetic induction at a point which is at a distance of from a long current carrying wire is . The field of induction at a distance from the current will be
MEDIUM
The magnitude of the magnetic field at the centre of an equilateral triangular loop of side which is carrying a current of is:
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HARD
A very long wire ABDMNDC is shown in figure carrying current I. AB and BC parts are straight, long and at right angle. At D wire forms a circular turn DMND of radius R. AB, BC parts are tangential to circular turn at N and D. Magnetic filed at the center of circle is:
EASY
A circular coil of wire consisting of turns each of radius carries a current of . The magnitude of the magnetic field at the centre of coil is
MEDIUM
Two infinitely long wires each carrying current along the same direction are made into the geometry as shown in the figure below.
The magnetic field at the point is
MEDIUM
One of the two identical conducting wires of length is bent in the form of a circular loop and the other one into a circular coil of identical turns. If the same current is passed in both, the ratio of the magnetic field at the centre of the loop to that at the centre of the coil i.e. will be
HARD
Two concentric circular loops, one of radius and the other of radius , lie in the -plane with the origin as their common center, as shown in the figure. The smaller loop carries current in the anti-clockwise direction and the larger loop carries current in the clockwise direction, with denotes the magnetic field at a point in the -plane. Which of the following statement(s) is (are) correct?
