A current-carrying closed loop in the form of a right isosceles triangle \(ABC\) is placed in a uniform magnetic field acting along with \(AB\). If the magnetic force on the arm \(BC\) is \(F,\) then what is the force on the arm \(AC\)?
            

1.	\(-F\)	2.	\(F\)
3.	\(2F\)	4.	\(-2F\)

A uniform electric field and a uniform magnetic field are acting in the same direction in a certain region. If an electron is projected in the region such that its velocity is pointed along the direction of fields, then the electron:

1.  speed will decrease

2.  speed will increase

3.  will turn towards the left of the direction of motion

4.  will turn towards the right of the direction of motion

A beam of cathode rays is subjected to cross Electric (E) and magnetic fields(B). The fields are adjusted such that the beam is not deflected. The specific charge of the cathode rays is given by:

1. $\frac{B^2}{2V{E}^2}$

2. $\frac{2V{B}^2}{E^2}$

3. $\frac{\mathrm{2V}{E}^2}{B^2}$

4. $\frac{E^2}{2V{B}^2}$

(where V is the potential difference between cathode and anode)

Under the influence of a uniform magnetic field, a charged particle moves with constant speed \(v\) in a circle of radius \(R.\) The time period of rotation of the particle:

A closed-loop \(PQRS\) carrying a current is placed in a uniform magnetic field. If the magnetic forces on segments \(PS,\) \(SR,\) and \(RQ\) are \(F_1, F_2~\text{and}~F_3\) respectively, and are in the plane of the paper and along the directions shown, then which of the following forces acts on the segment \(QP?\)
        

1. \(F_{3} - F_{1} - F_{2}\)

2. \(\sqrt{\left(F_{3} - F_{1}\right)^{2} + F_{2}^{2}}\)

3. \(\sqrt{\left(F_{3} - F_{1}\right)^{2} - F_{2}^{2}}\)

4. \(F_{3} - F_{1} + F_{2}\)

A particle of mass \(m,\) charge \(Q,\) and kinetic energy \(T\) enters a transverse uniform magnetic field of induction \(\vec B.\) What will be the kinetic energy of the particle after seconds?