KCET 2022 | Moving Charges and Magnetism Question 18 | Physics

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.

KCET 2021

MCQ (Single Correct Answer)

-0

A copper rod $$A B$$ of length $$l$$ is rotated about end $$A$$ with a constant angular velocity $$\omega$$. The electric field at a distance $$x$$ from the axis of rotation is

$$\frac{m \omega^2 x}{e}$$

$$\frac{m \omega x}{e}$$

$$\frac{m x}{\omega^2 l}$$

$$\frac{m e}{\omega^2 x}$$

KCET 2021

MCQ (Single Correct Answer)

-0

A strong magnetic field is applied on a stationary electron. Then, the electron

moves in the direction of the field

moves in an opposite direction of the field

remains stationary

starts spinning

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