NEET Physics Magnetic Effects of Current and Magnetism Superposition Of Magnetic Fields MCQs

Two infinitely long parallel wires carry currents $I_1$ and $I_2$ in the same direction. The distance between the wires is $d$. A point P lies in the plane of the wires at a distance $x$ from the wire carrying current $I_1$. If the magnetic field at P is zero, the ratio $I_1/I_2$ is:

A square loop of side $a$ carries a current $I$. A long straight wire carrying current $I$ is placed in the plane of the loop parallel to one of its sides at a distance $a$ from that side. The net force on the loop due to the wire is:

Two coaxial circular coils of radii $a$ and $b$ ($a < b$) carry currents $I_1$ and $I_2$ respectively. If the resultant magnetic field at the center is zero, the ratio of $I_1/I_2$ is:

Two infinitely long, parallel wires carry currents $I_1$ and $I_2$ in the same direction. The distance between the wires is 'd'. A point P lies in the plane of the wires at a distance 'x' from wire 1. If the magnetic field at P is zero, and $I_1 = 2I_2$, which of the following relations is correct?

A circular loop of radius 'R' carries a current 'I'. A long, straight wire carrying a current '2I' is placed in the plane of the loop, parallel to a diameter and at a distance 'R/2' from the center of the loop. If the net magnetic field at the center of the loop is zero, what is the direction of the current in the straight wire relative to the current in the nearest segment of the loop?

Two coaxial circular loops of radii 'a' and 'b' (b > a) carry currents $I_1$ and $I_2$ respectively in opposite directions. The loops are separated by a distance 'd' which is much larger than both 'a' and 'b' (d >> a, b). The magnetic field at a point on the axis, at a distance 'x' from the center of the smaller loop (x >> a, b) can be approximated by:

Two long parallel wires carry currents in the same direction. What is the nature of the magnetic field between the wires?

Two identical current-carrying circular loops are placed coaxially with their centers overlapping. If the currents flow in opposite directions, what is the magnetic field at the center?

At a certain point in space, two magnetic fields are present, one with a magnitude of 3 T directed north and another with a magnitude of 4 T directed east. What is the magnitude of the resultant magnetic field?

A straight wire carries a current. If the current is doubled, how does the magnetic field at a point near the wire change?