1
MHT CET 2023 9th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

A conducting wire of length $$2500 \mathrm{~m}$$ is kept in east-west direction, at a height of $$10 \mathrm{~m}$$ from the ground. If it falls freely on the ground then the current induced in the wire is (Resistance of wire $$=25 \sqrt{2} \Omega$$, acceleration due to gravity $$\mathrm{g}=10 \mathrm{~m} / \mathrm{s}^2, \mathrm{~B}_{\mathrm{H}}=2 \times 10^{-5} \mathrm{~T}$$ )

A
$$0.2 \mathrm{~A}$$
B
$$0.02 \mathrm{~A}$$
C
$$0.01 \mathrm{~A}$$
D
$$2 \mathrm{~A}$$
2
MHT CET 2023 9th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

Self inductance of solenoid is

A
directly proportional to current flowing through the coil.
B
directly proportional to the length.
C
directly proportional to its area of cross-section.
D
inversely proportional to the area of cross-section.
3
MHT CET 2022 11th August Evening Shift
MCQ (Single Correct Answer)
+1
-0

The magnetic flux through a coil of resistance '$$R$$' changes by an amount '$$\Delta \phi$$' in time '$$\Delta \mathrm{t}$$'. The total quantity of induced electric charge '$$\mathrm{Q}$$' is

A
$$-\frac{\Delta \phi}{\Delta \mathrm{t}}+\mathrm{R}$$
B
$$\frac{\Delta \phi}{\Delta \mathrm{t}} \times \mathrm{R}$$
C
$$\frac{\Delta \phi}{\mathrm{R}}$$
D
$$\frac{\Delta \phi}{\Delta t}$$
4
MHT CET 2022 11th August Evening Shift
MCQ (Single Correct Answer)
+1
-0

Self inductance of a solenoid cannot be increased by

A
decreasing its length
B
increasing its area of cross-section
C
increasing the current through it
D
increasing the number of turns in it
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