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WB JEE 2020 Physics - Alternating Current Question 9 English
When a DC voltage is applied at the two ends of a circuit kept in a closed box, it is observed that the current gradually increases from zero to a certain value and then remains constant. What do you think that the circuit contains?
A
A resistor alone
B
A capacitor alone
C
A resistor and an inductor in series
D
A resistor and a capacitor in series
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Consider the circuit shown.

WB JEE 2020 Physics - Current Electricity Question 32 English
If all the cells have negligible internal resistance, what will be the current through the 2$$\Omega $$ resistor when steady state is reached?
A
0.66 A
B
0.29 A
C
0 A
D
0.14 A
3
WB JEE 2020
MCQ (Single Correct Answer)
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Consider a conducting wire of length L bent in the form of a circle of radius R and another conductor of length a (a < < R) is bent in the form of a square. The two loops are then placed in same plane such that the square loop is exactly at the centre of the circular loop. What will be the mutual inductance between the two loops?
A
$${\mu _0}{{\pi {a^2}} \over L}$$
B
$${\mu _0}{{\pi {a^2}} \over 16L}$$
C
$${\mu _0}{{\pi {a^2}} \over 4L}$$
D
$${\mu _0}{{{a^2}} \over {4\pi L}}$$
4
WB JEE 2020
MCQ (Single Correct Answer)
+1
-0.25
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An object, is placed 60 cm in front of a convex mirror of focal length 30 cm. A plane mirror is now placed facing the object in between the object and the convex mirror such that it covers lower half of the convex mirror. What should be the distance of the plane mirror from the object, so that there will be no parallax between the images formed by the two mirrors?
A
40 cm
B
30 cm
C
20 cm
D
15 cm
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