KCET 2022 | Moving Charges and Magnetism Question 6 | Physics

A proton moves with a velocity of $$5 \times 10^6 \hat{\mathbf{\widehat j} m \mathrm{~m}^{-1}}$$ through the uniform electric field, $$\mathbf{\overrightarrow E}=4 \times 10^6[2 \hat{\mathbf{i}}+0.2 \hat{\mathbf{j}}+0.1 \hat{\mathbf{k}}] \mathrm{Vm}^{-1}$$ and the uniform magnetic field $$\mathbf{\overrightarrow B}=0.2[\hat{\mathbf{i}}+0.2 \hat{\mathbf{j}}+\hat{\mathbf{k}}] \mathrm{T}$$. The approximate net force acting on the proton is

$$25 \times 10^{-13} \mathrm{~N}$$

$$2.2 \times 10^{-13} \mathrm{~N}$$

$$20 \times 10^{-13} \mathrm{~N}$$

$$5 \times 10^{-13} \mathrm{~N}$$

KCET 2022

MCQ (Single Correct Answer)

-0

A solenoid of length $$50 \mathrm{~cm}$$ having 100 turns carries a current of $$2.5 \mathrm{~A}$$. The magnetic field at one end of the solenoid is

$$6.28 \times 10^{-4} \mathrm{~T}$$

$$1.57 \times 10^{-4} \mathrm{~T}$$

$$9.42 \times 10^{-4} \mathrm{~T}$$

$$3.14 \times 10^{-4} \mathrm{~T}$$

KCET 2022

MCQ (Single Correct Answer)

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A circular coil of wire of radius $$r$$ has $$n$$ turns and carries a current $$I$$. The magnetic induction $$B$$ at a point on the axis of the coil at a distance $$\sqrt{3} r$$ from its centre is

$$\frac{\mu_0 n I}{8 r}$$

$$\frac{\mu_0 n I}{16 r}$$

$$\frac{\mu_0 n I}{4 r}$$

$$\frac{\mu_0 n I}{32 r}$$

KCET 2022

MCQ (Single Correct Answer)

-0

Which of the following statements proves that Earth has a magnetic field ?

Earth is a planet rotating about the NorthSouth axis.

Earth is surrounded by ionosphere.

A large quantity of iron-ore is found in the Earth.

The intensity of cosmic rays stream of charged particles is more at the poles than at the equator.

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