1
MHT CET 2023 10th May Morning Shift
+1
-0

Electron of mass '$$\mathrm{m}$$' and charge '$$\mathrm{q}$$' is travelling with speed '$$v$$' along a circular path of radius '$$R$$', at right angles to a uniform magnetic field of intensity '$$B$$'. If the speed of the electron is halved and the magnetic field is doubled, the resulting path would have radius

A
$$4 \mathrm{R}$$
B
$$2 \mathrm{R}$$
C
$$\frac{\mathrm{R}}{2}$$
D
$$\frac{\mathrm{R}}{4}$$
2
MHT CET 2023 9th May Evening Shift
+1
-0

10 A current is flowing in two straight parallel wires in the same direction. Force of attraction between them is $$1 \times 10^{-3} \mathrm{~N}$$. If the current is doubled in both the wires the force will be

A
$$1 \times 10^{-3} \mathrm{~N}$$
B
$$2 \times 10^{-3} \mathrm{~N}$$
C
$$4 \times 10^{-3} \mathrm{~N}$$
D
$$0.25 \times 10^{-3} \mathrm{~N}$$
3
MHT CET 2023 9th May Evening Shift
+1
-0

The magnetic field at a point $$\mathrm{P}$$ situated at perpendicular distance '$$R$$' from a long straight wire carrying a current of $$12 \mathrm{~A}$$ is $$3 \times 10^{-5} \mathrm{~Wb} / \mathrm{m}^2$$. The value of '$$\mathrm{R}$$' in $$\mathrm{mm}$$ is $$\left[\mu_0=4 \pi \times 10^{-7} \mathrm{~Wb} / \mathrm{Am}\right]$$

A
0.08
B
0.8
C
8
D
80
4
MHT CET 2023 9th May Morning Shift
+1
-0

A long straight wire carrying a current of $$25 \mathrm{~A}$$ rests on the table. Another wire PQ of length $$1 \mathrm{~m}$$ and mass $$2.5 \mathrm{~g}$$ carries the same current but in the opposite direction. The wire PQ is free to slide up and down. To what height will wire PQ rise? ($$\mu_0=4 \pi \times 10^{-7}$$ SI unit)

A
3 mm
B
4 mm
C
5 mm
D
8 mm
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