Q 11 :

An electron is moving along the positive $x$-axis. If the uniform magnetic field is applied parallel to the negative $z$-axis, then           [2023]

A. The electron will experience magnetic force along positive y-axis

B. The electron will experience magnetic force along negative y-axis

C. The electron will not experience any force in magnetic field

D. The electron will continue to move along the positive x-axis

E. The electron will move along circular path in magnetic field

Choose the correct answer from the options given below:

• B and E only

   

• A and E only

   

• C and D only

   

• B and D only

   

Q 12 :

A single turn current loop in the shape of a right angle triangle with sides 5 cm, 12 cm, 13 cm is carrying a current of 2 A. The loop is in a uniform magnetic field of magnitude 0.75 T whose direction is parallel to the current in the 13 cm side of the loop. The magnitude of the magnetic force $x$ on the 5 cm side will be $\frac{x}{130}\text{N}$. The value of $x$ is _______.              [2023]

Q 13 :

A straight wire AB of mass 40 g and length 50 cm is suspended by a pair of flexible leads in a uniform magnetic field of magnitude 0.40 T as shown in the figure. The magnitude of the current required in the wire to remove the tension in the supporting leads is _________ A.  (Take $g=10{\text{\hspace{0.05em}ms}}^{-2}$)                 [2023]