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1
KCET 2021
MCQ (Single Correct Answer)
+1
-0

A tightly wound long solenoid has $n$ turns per unit length, a radius $$r$$ and carries a current $$I$$. A particle having charge $$q$$ and mass $$m$$ is projected from a point on the axis in a direction perpendicular to the axis. The maximum speed of the particle for which the particle does not strike the solenoid is

A
$$\frac{\mu_0 n I q r}{m}$$
B
$$\frac{\mu_0 n I q r}{2 m}$$
C
$$\frac{\mu_0 n I q r}{4 m}$$
D
$$\frac{\mu_0 n I q r}{8 m}$$
2
KCET 2021
MCQ (Single Correct Answer)
+1
-0

Which of the field pattern given below is valid for electric field as well as for magnetic field?

A
KCET 2021 Physics - Moving Charges and Magnetism Question 31 English Option 1
B
KCET 2021 Physics - Moving Charges and Magnetism Question 31 English Option 2
C
KCET 2021 Physics - Moving Charges and Magnetism Question 31 English Option 3
D
KCET 2021 Physics - Moving Charges and Magnetism Question 31 English Option 4
3
KCET 2020
MCQ (Single Correct Answer)
+1
-0

In the given figure, the magnetic field at $$O$$.

KCET 2020 Physics - Moving Charges and Magnetism Question 26 English

A
$$\frac{3}{4} \frac{\mu_0 I}{r}+\frac{\mu_0 I}{4 \pi r}$$
B
$$\frac{3}{10} \frac{\mu_0 I}{r}-\frac{\mu_0 I}{4 \pi r}$$
C
$$\frac{3}{8} \frac{\mu_0 I}{r}+\frac{\mu_0 I}{4 \pi r}$$
D
$$\frac{3}{8} \frac{\mu_0 I}{r}-\frac{\mu_0 I}{4 \pi r}$$
4
KCET 2020
MCQ (Single Correct Answer)
+1
-0

The magnetic field at the origin due to a current element $$i d \mathbf{l}$$ placed at a point with vector position $$\mathrm{r}$$ is

A
$$\frac{\mu_0 i}{4 \pi} \frac{d \mathbf{l} \times \mathbf{r}}{r^3}$$
B
$$\frac{\mu_0 i}{4 \pi} \frac{\mathbf{r} \times d \mathbf{l}}{r^3}$$
C
$$\frac{\mu_0 i}{4 \pi} \frac{d \mathbf{l} \times \mathbf{r}}{r^2}$$
D
$$\frac{\mu_0 i}{4 \pi} \frac{\mathbf{r} \times d \mathbf{l}}{r^2}$$
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