EASY
JEE Main/Advance
IMPORTANT
Earn 100

A horizontal overhead powerline is at a height of from the ground and carries a current of from east to west. The magnetic field directly below it on the ground is :
(a) northward
(b) southward
(c) northward
(d) southward

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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 at the origin is:

MEDIUM
JEE Main/Advance
IMPORTANT
Due to the presence of the current at the origin :

HARD
JEE Main/Advance
IMPORTANT
A current flows in an infinitely long wire with cross-section in the form of a semicircular ring of radius . The magnitude of the magnetic induction along its axis is :

MEDIUM
JEE Main/Advance
IMPORTANT
An electric charge moves with velocity in an electromagnetic field given by : and . The component of the force experienced by is :

MEDIUM
JEE Main/Advance
IMPORTANT
A thin circular disk of radius is uniformly charged with density per unit area. The disk rotates about its axis with a uniform angular speed . The magnetic moment of the disk is :

MEDIUM
JEE Main/Advance
IMPORTANT
Two coaxial solenoids of different radii carry current in the same direction. Let be the magnetic force on the inner solenoid due to the outer one and 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 , are held by insulating threads of length and are in equilibrium as shown in the figure, with threads making an angle with the vertical. If wires have mass per unit length then the value of is : (is gravitational acceleration)

HARD
JEE Main/Advance
IMPORTANT
A rectangular loop of sides and carrying a currentof is placed in different orientations as shown in the figures below :
If there is a uniform magnetic field of in the positive direction, in which orientations the loop would be in (i) stable equilibrium and (ii) unstable equilibrium ?
