JEE Main 2021 (Online) 16th March Evening Shift | Magnetic Effect of Current Question 131 | Physics

A charge Q is moving $$\overrightarrow {dl} $$ distance in the magnetic field $$\overrightarrow {B} $$. Find the value of work done by $$\overrightarrow {B} $$.

Zero

$$-$$1

Infinite

JEE Main 2021 (Online) 25th February Morning Shift

MCQ (Single Correct Answer)

-1

A proton, a deuteron and an $$\alpha$$ particle are moving with same momentum in a uniform magnetic field. The ratio of magnetic forces acting on them is _________ and their speed is _______, in the ratio.

2 : 1 : 1 and 4 : 2 : 1

4 : 2 : 1 and 2 : 1 : 1

1 : 2 : 4 and 2 : 1 : 1

1 : 2 : 4 and 1 : 1 : 2

JEE Main 2021 (Online) 25th February Morning Shift

MCQ (Single Correct Answer)

-1

Magnetic fields at two points on the axis of a circular coil at a distance of 0.05 m and 0.2 m from the centre are in the ratio 8 : 1. The radius of coil is ________.

1.0 m

0.15 m

0.2 m

0.1 m

JEE Main 2020 (Online) 6th September Evening Slot

MCQ (Single Correct Answer)

-1

A square loop of side 2$$a$$ and carrying current I is kept in xz plane with its centre at origin. A long wire carrying the same current I is placed parallel to z-axis and passing through point (0, b, 0), (b >> a). The magnitude of torque on the loop about z-axis will be :

$${{2{\mu _0}{I^2}{a^2}} \over {\pi b}}$$

$${{2{\mu _0}{I^2}{a^2}b} \over {\pi \left( {{a^2} + {b^2}} \right)}}$$

$${{{\mu _0}{I^2}{a^2}b} \over {2\pi \left( {{a^2} + {b^2}} \right)}}$$

$${{{\mu _0}{I^2}{a^2}} \over {2\pi b}}$$

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