List of top Physics Questions on Magnetic Force on a Current-Carrying Wire

Derive an expression for the force \(\vec F\) acting on a conductor of length \(L\) and area of cross-section \(A\) carrying current \(I\) and placed in a magnetic field \(\vec B\).
A part of a wire carrying \(2.0\) A current and bent at \(90^\circ\) at two points is placed in a region of uniform magnetic field \[ \vec B=-0.50\,\hat k\,T. \]
Calculate the magnitude of the net force acting on the wire.
Derive an expression for the force \(\vec F\) acting on a conductor of length \(L\) and area of cross-section \(A\) carrying current \(I\) and placed in a magnetic field \(\vec B\).
A part of a wire carrying \(2.0\) A current and bent at \(90^\circ\) at two points is placed in a region of uniform magnetic field \[ \vec B=-0.50\,\hat k\,T. \]
Calculate the magnitude of the net force acting on the wire.
બે અનંત લાંબી સમાંતર વાહક તાર A અને B માં I અને 2I કરંટ સમાન દિશામાં છે. A ફ્લોર પર છે અને B, h ઊંચાઈએ છે. તાર A ઊઠતો ન થાય તે માટે h નું ન્યૂનતમ મૂલ્ય છે:
Two infinitely long parallel conducting wires \(A\) and \(B\) carry currents \(I\) and \(2I\), respectively, in the same direction. Wire \(A\) lies on an insulated floor while wire \(B\) is fixed at a height \(h\) above the floor. The minimum value of \(h\) so that wire \(A\) does not rise from the floor is:
A horizontal wire of length \(10\,\text{cm}\) and mass \(0.3\,\text{g}\) carries a current of \(5\,\text{A}\). The magnitude of the magnetic field which can keep the wire in suspension is \[ (g=10\,\text{m s}^{-2}) \]
A straight wire of mass \(200\,\text{g}\) and length \(1.5\,\text{m}\) carries a current of \(2\,\text{A}\). It is suspended in mid-air by a uniform horizontal magnetic field \(B\). The magnitude of \(B\) is \((g=10\,\text{m s}^{-2})\):
A straight wire of mass \(500\,\text{g}\) and length \(7\,\text{m}\) carries a current of \(1.4\,\text{A}\). It is suspended in mid-air by a uniform horizontal magnetic field \(B\) perpendicular to the length of the wire. The magnitude of the magnetic field is:
If a straight wire of length \(175\,\text{cm}\) and mass \(250\,\text{g}\) is suspended freely in a uniform horizontal magnetic field of \(0.7\,\text{T}\), then the current flowing through the wire is:
A wire carrying current \(i\), bent as shown in the figure, is placed in a uniform magnetic field \(B\) directed normally out of the plane of the figure. The force on the wire is:
A conductor is placed along z-axis carrying current in z direction in uniform magnetic field directed along y-axis. The magnetic force acting on the conductor is directed along:
A 1 cm segment of a wire lying along the x-axis carries a current of 0.5 A along the \( +x \)-direction. A magnetic field \( \vec{B} = (0.4 \, \text{mT} \hat{j}) + (0.6 \, \text{mT} \hat{k}) \) is switched on. The force acting on the segment is:
A square loop of copper wire is pulled through a region of uniform magnetic field as shown. Rank the pulling forces \(F_A\), \(F_B\), \(F_C\), and \(F_D\) that must be applied to keep the loop moving with constant speed (\(\vec{v}\)):
square loop of copper wire is pulled through a region
A straight wire is placed in a magnetic field that varies with distance $x$ from origin as $B = B_0 (2 - \frac{x}{n}) \hat{k}$. The ends of the wire are at $(a, 0)$ and $(2n, 0)$ and it carries a current $I$. If the force on the wire is $F = 1 B_0 \left(\frac{k a}{2}\right) \hat{j}$, then the value of $k$ is
A horizontal semi-circular wire of radius $r$ is connected to a battery through two similar springs $X$ and $Y$ to an electric cell, which sends current $I$ through it. A vertically downward uniform magnetic field $B$ is applied on the wire, as shown in the figure. What is the force acting on each spring?
A horizontal semi-circular wire of radius
A positive charge q is distributed over a circular ring of radius a. It is placed in a horizontal plane and is rotated about its axis at a uniform angular speed $\omega$. A horizontal magnetic field B exists in the space. The torque acting on the ring due to the magnetic force is ________.
A cylindrical conductor of radius R is carrying a constant current. The plot of the magnitude of the magnetic field, B with the distance, d, from the centre of the conductor, is correctly represented by the figure :
Two parallel wire carries current I1 and I2 are separated by distance d. Force per unit length of wire is F. Then :