1

JEE Main 2021 (Online) 31st August Evening Shift

Numerical

+4

-1

A long solenoid with 1000 turns/m has a core material with relative permeability 500 and volume 10

^{3}cm^{3}. If the core material is replaced by another material having relative permeability of 750 with same volume maintaining same current of 0.75 A in the solenoid, the fractional change in the magnetic moment of the core would be approximately $$\left( {{x \over {499}}} \right)$$. Find the value of x.Your input ____

2

JEE Main 2021 (Online) 27th August Evening Shift

Numerical

+4

-1

A plane electromagnetic wave with frequency of 30 MHz travels in free space. At particular point in space and time, electric field is 6 V/m. The magnetic field at this point will be x $$\times$$ 10

^{$$-$$8}T. The value of x is ___________.Your input ____

3

JEE Main 2021 (Online) 27th August Morning Shift

Numerical

+4

-1

A uniform conducting wire of length is 24a, and resistance R is wound up as a current carrying coil in the shape of an equilateral triangle of side 'a' and then in the form of a square of side 'a'. The coil is connected to a voltage source V

_{0}. The ratio of magnetic moment of the coils in case of equilateral triangle to that for square is 1 : $$\sqrt y $$ where y is ................. .Your input ____

4

JEE Main 2021 (Online) 26th August Evening Shift

Numerical

+4

-1

A circular coil of radius 8.0 cm and 20 turns is rotated about its vertical diameter with an angular speed of 50 rad s

^{$$-$$1}in a uniform horizontal magnetic field of 3.0 $$\times$$ 10^{$$-$$2}T. The maximum emf induced the coil will be ................. $$\times$$ 10^{$$-$$2}volt (rounded off to the nearest integer)Your input ____

Questions Asked from Magnetics (Numerical)

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