EASY
JEE Main/Advance
IMPORTANT
Earn 100

A horizontal overhead powerline is at a height of 4 m from the ground and carries a current of 100 A from east to west. The magnetic field directly below it on the ground is  (μ0 =4π×107 T mA1 ) :

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Important Questions on Magnetic Effect of Current

MEDIUM
JEE Main/Advance
IMPORTANT

The magnitude of the magnetic field due to the loop ABCD at the origin (O) is:

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MEDIUM
JEE Main/Advance
IMPORTANT

Due to the presence of the current I1 at the origin :

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HARD
JEE Main/Advance
IMPORTANT
A current I flows in an infinitely long wire with cross-section in the form of a semicircular ring of radius R. The magnitude of the magnetic induction along its axis is :
MEDIUM
JEE Main/Advance
IMPORTANT
An electric charge +q moves with velocityv=3i^+4j^+k^  in an electromagnetic field given by : E=3i^+j^+2k^ and B=i^+j^+3k^. The y - component of the force experienced by + q is :
MEDIUM
JEE Main/Advance
IMPORTANT
A thin circular disk of radius R is uniformly charged with density σ> 0 per unit area. The disk rotates about its axis with a uniform angular speed ω. The magnetic moment of the disk is :
MEDIUM
JEE Main/Advance
IMPORTANT
Two coaxial solenoids of different radii carry current I in the same direction. Let F1 be the magnetic force on the inner solenoid due to the outer one and F2 be the magnetic force on the outer solenoid due to the inner one. Then :
MEDIUM
JEE Main/Advance
IMPORTANT

Two long current carrying thin wires, both with current I, are held by insulating threads of length L and are in equilibrium as shown in the figure, with threads making an angle θ with the vertical. If wires have mass λ per unit length then the value of I is : (g is gravitational acceleration)

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HARD
JEE Main/Advance
IMPORTANT

A rectangular loop of sides 10 cm and 5 cm carrying a current I of 12 A is placed in different orientations as shown in the figures below :

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If there is a uniform magnetic field of 0.3 T in the positive z direction, in which orientations the loop would be in (i) stable equilibrium and (ii) unstable equilibrium ?