1
JEE Main 2021 (Online) 18th March Morning Shift
MCQ (Single Correct Answer)
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A loop of flexible wire of irregular shape carrying current is placed in an external magnetic field. Identify the effect of the field on the wire.
A
Loop assumes circular shape with its plane normal to the field.
B
Loop assumes circular shape with its plane parallel to the field.
C
Wire gets stretched to become straight.
D
Shape of the loop remains unchanged.
2
JEE Main 2021 (Online) 18th March Morning Shift
MCQ (Single Correct Answer)
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The time period of a satellite in a circular orbit of radius R is T. The period of another satellite in a circular orbit of radius 9R is :
A
9 T
B
27 T
C
12 T
D
3 T
3
JEE Main 2021 (Online) 18th March Morning Shift
Numerical
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A particle performs simple harmonic motion with a period of 2 second. The time taken by the particle to cover a displacement equal to half of its amplitude from the mean position is $${1 \over a}$$s. The value of 'a' to the nearest integer is _________.
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4
JEE Main 2021 (Online) 18th March Morning Shift
Numerical
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The circuit shown in the figure consists of a charged capacitor of capacity 3 $$\mu$$F and a charge of $$\mu$$C. At time t = 0, when the key is closed, the value of current flowing through the 5 M$$\Omega$$ resistor is 'x' $$\mu$$-A. The value of 'x to the nearest integer is ___________.

JEE Main 2021 (Online) 18th March Morning Shift Physics - Capacitor Question 73 English
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