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

An ion with a charge of $ + 32 \times 10^{-19}C $ is in a region where a uniform electric field of $ 5 \times 10^4\, V/m $ is perpendicular to a uniform magnetic field of $ 0.8 \,T $ . If its acceleration is zero, then its speed must be
A triangular loop of side $ 1 $ carries a current $ i $ . It is placed in a magnetic field $ B $ , such that the plane of the loop is in the direction of $ B $ . The torque on the loop is
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 $B$. It is then bent into a circular coil of $n$ turns. The magnetic field at the centre of this coil of $n$ turns will be
A circular loop of area $1\,cm^{2} $ , carrying a current of $10\,A$ is placed in a magnetic field of $0.1\,T$ perpendicular to the plane of the loop. The torque on the loop due to the magnetic field is
Four conductors carrying $2.0\, A$ of current into or out of the page are shown in the diagram. $A$ path $C$ is indicated for the line integral $\oint B$. $d s$. Find the value of the integral for the path $C$.
A cyclotron is operated at an oscillator frequency of $ 12\, MHz $ and has a dee radius $ R = 50\,cm $ . What is the magnitude of the magnetic field needed for a proton to be accelerated in the cyclotron ?
A planar coil having $12$ turns carries $15\, A$ current. The coil is oriented with respect to the uniform magnetic field $\vec{B}=0.2\, \hat{i} T$ such that its directed area is $\vec{A}=-0.04\, \hat{i} m ^{2}$ . The potential energy of the coil in the given orientation is
A closely wound solenoid $80 \,cm$ long has $5$ layers of winding of $400$ turns each. The diameter of the solenoid is $1.8\, cm$. If the current carried is $8.0\, A$, the magnitude of $B$ inside the solenoid near its centre will be
An electron having momentum $2.4 \times 10^{-23} \,kg \,ms ^{-1}$ enters a region of uniform magnetic field of $0.15 \,T$. The field vector makes an angle of $30^{\circ}$ with the initial velocity vector of the electron. The radius of the helical path of the electron in the field shall be