List of top Physics Questions on Moving charges and magnetism asked in AP EAPCET

If a wire of length 196 cm carrying a current of 0.98 A is bent in the form of a circular loop of two turns, then the magnetic field at the centre of the loop is approximately:

A particle of mass \(1\times10^{-27}\ \text{kg}\) and charge \(1\times10^{-16}\ \text{C}\) enters the uniform magnetic field inside a solenoid at speed \(1000\ \text{m s}^{-1}\). The velocity vector makes an angle \(60^\circ\) with the axis of the solenoid. The solenoid has \(5000\) turns along its length and carries current \(5\ \text{A}\). The number of revolutions the particle makes along the helical path within the solenoid by the time it emerges from the solenoid's opposite end is:

Two long parallel straight metal wires \(A\) and \(B\) carrying currents \(12\text{ A}\) and \(36\text{ A}\) respectively, in the same direction are separated by \(50\text{ cm}\). The point relative to \(A\), where the resultant magnetic induction between the two wires due to the currents is zero, will be

A long current carrying wire produces a magnetic field of \(1\ \text{T}\) at a distance \(r\). The magnetic field at
\[ (a)\ \frac{r}{2}, \qquad (b)\ 2r, \qquad (c)\ 3r \] is

A charged particle moving in a uniform magnetic field penetrates a layer of lead and thereby loses half of its kinetic energy, then the radius of curvature of its path is: