1
AP EAPCET 2022 - 4th July Morning Shift
+1
-0

Two electrons, $$e_1$$ and $$e_2$$ of mass $$m$$ and charge $$q$$ are injected into the perpendicular direction of the magnetic field $$B$$ such that the kinetic energy of $$e_1$$ is double than that of $$e_2$$. The relation of their frequencies of rotation, $$f_1$$ and $$f_2$$ is

A
$$f_1=f_2$$
B
$$f_1=2 f_2$$
C
$$2 f_1=f_2$$
D
$$4 f_1=f_2$$
2
AP EAPCET 2021 - 20th August Morning Shift
+1
-0

A wire of length $$L$$ metre carrying a current $$I$$ ampere is bent in the form of a circle. Magnitude of its magnetic moment is

A
$$\frac{L^2 I^2}{4 \pi}$$
B
$$\frac{L^2 I}{4 \pi}$$
C
$$\frac{L I}{4 \pi}$$
D
$$\frac{L I^2}{4 \pi}$$
3
AP EAPCET 2021 - 20th August Morning Shift
+1
-0

What is the net force on the square coil?

A
25 $$\times$$ 10$$^{-7}$$ N moving towards wire
B
25 $$\times$$ 10$$^{-7}$$ N moving away from wire
C
35 $$\times$$ 10$$^{-7}$$ N moving towards wire
D
35 $$\times$$ 10$$^{-7}$$ N moving away from wire
4
AP EAPCET 2021 - 19th August Evening Shift
+1
-0

In a co-axial, straight cable, the central conductor and the outer conductor carry equal currents in opposite directions. The magnetic field is zero

A
outside the cable
B
inside the inner conductor
C
inside the outer conductor
D
in between the two conductors
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