MHT CET 2023 14th May Morning Shift | Moving Charges and Magnetism Question 42 | Physics

A straight wire carrying a current (I) is turned into a circular loop. If the magnitude of the magnetic moment associated with it is '$$M$$', then the length of the wire will be

$$\frac{\mathrm{M} \pi}{4 \mathrm{I}}$$

$$\left[\frac{4 \pi I}{M}\right]^{\frac{1}{2}}$$

$$\left[\frac{4 \mathrm{M} \pi}{\mathrm{I}}\right]^{\frac{1}{2}}$$

$$4 \pi \mathrm{MI}$$

MHT CET 2023 14th May Morning Shift

MCQ (Single Correct Answer)

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A solenoid of length $$0.4 \mathrm{~m}$$ and having 500 turns of wire carries a current $$3 \mathrm{~A}$$. A thin coil having 10 turns of wire and radius $$0.1 \mathrm{~m}$$ carries current $$0.4 \mathrm{~A}$$. the torque required to hold the coil in the middle of the solenoid with its axis perpendicular to the axis of the solenoid is $$\left(\mu_0=4 \pi \times 10^{-7}\right.$$ SI units, $$\left.\pi^2=10\right)\left(\sin 90^{\circ}=1\right)$$

$$3 \times 10^{-6} \mathrm{~Nm}$$

$$12 \times 10^{-6} \mathrm{~Nm}$$

$$6 \times 10^{-4} \mathrm{~Nm}$$

$$24 \times 10^{-6} \mathrm{~Nm}$$

MHT CET 2023 14th May Morning Shift

MCQ (Single Correct Answer)

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Two circular coils made from same wire but radius of $$1^{\text {st }}$$ coil is twice that of $$2^{\text {nd }}$$ coil. If magnetic field at their centres is same then ratio of potential difference applied across them is ($$1^{\text {st }}$$ to $$2^{\text {nd }}$$ coil)

MHT CET 2023 13th May Evening Shift

MCQ (Single Correct Answer)

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The ratio of magnetic field at the centre of the current carrying circular loop and magnetic moment is $$X$$. When both the current and radius are doubled, then the ratio will be

$$2 X$$

$$\frac{X}{2}$$

$$\frac{X}{4}$$

$$\frac{X}{8}$$

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