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

Two infinitely long wires each carrying the same current and pointing in $$+y$$ direction are placed in the $$x y$$-plane, at $$x=-2 \mathrm{~cm}$$ and $$x=1 \mathrm{~cm}$$. An electron is fired with speed $$u$$ from the origin making an angle of $$+45^{\circ}$$ from the $$X$$-axis. The force on the electron at the instant it is fired is

[$$B_0$$ is the magnitude of the field at origin due to the wire at $$x=1 \mathrm{~cm}$$ alone].

A
$$\frac{-e u B_0}{2 \sqrt{2}}(\hat{\boldsymbol{i}}-\hat{\boldsymbol{j}})$$
B
$$\frac{-e u B_0}{2}(\hat{\boldsymbol{i}}-\hat{\boldsymbol{j}})$$
C
$$\frac{-e u B_0}{\sqrt{2}}(\hat{\boldsymbol{i}}-\hat{\boldsymbol{j}})$$
D
$$-\operatorname{euB_0}(\hat{\boldsymbol{i}}-\hat{\boldsymbol{j}})$$
2
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
$$4 f_1=f_2$$
3
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
$$\frac{L I^2}{4 \pi}$$
4
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
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