1
MHT CET 2023 12th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

A coil of '$$n$$' turns and radius '$$R$$' carries a current '$$I$$'. It is unwound and rewound again to make another coil of radius $$\left(\frac{\mathrm{R}}{3}\right)$$, current remaining the same. The ratio of magnetic moment of the new coil to that of original coil is

A
$$3: 1$$
B
$$1: 3$$
C
$$9: 1$$
D
$$1: 9$$
2
MHT CET 2023 12th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

An electron makes a full rotation in a circle of radius $$0.8 \mathrm{~m}$$ in one second. The magnetic field at the centre of the circle is $$\left(\mu_0=4 \pi \times 10^{-7}\right.$$ SI units)

A
$$4 \pi \times 10^{-26} \mathrm{~T}$$
B
$$2 \pi \times 10^{-26} \mathrm{~T}$$
C
$$4 \pi \times 10^{-19} \mathrm{~T}$$
D
$$2 \pi \times 10^{-19} \mathrm{~T}$$
3
MHT CET 2023 12th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

$$\mathrm{A}, \mathrm{B}$$ and $$\mathrm{C}$$ are three parallel conductors of equal lengths and carry currents I, I and 2I respectively as shown in figure. Distance $$A B$$ and $$B C$$ is same as '$$d$$'. If '$$F_1$$' is the force exerted by $$\mathrm{B}$$ on $$\mathrm{A}$$ and $$\mathrm{F}_2$$ is the force exerted by $$\mathrm{C}$$ on $$\mathrm{A}$$, then

MHT CET 2023 12th May Morning Shift Physics - Moving Charges and Magnetism Question 38 English

A
$$F_1=F_2$$
B
$$F_1=-F_2$$
C
$$F_1=2 F_2$$
D
$$\mathrm{F}_1=\frac{1}{2} \mathrm{~F}_2$$
4
MHT CET 2023 12th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

The magnetic moment of a current (I) carrying circular coil of radius '$$r$$' and number of turns '$$n$$' depends on

A
n only
B
I only
C
r only
D
$$\mathrm{n}, \mathrm{I}$$ and $$\mathrm{r}$$
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