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IMPORTANT
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As shown in the figure, a metallic rod of linear density 0.45 kg m-1 is lying horizontally on a smooth incline plane which makes an angle of 45° with the horizontal. The minimum current flowing in the rod required to keep it stationary, when 0.15 T magnetic field is acting on it in the vertically upward direction, will be

(Use g=10 m s-2)

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Important Questions on Magnetic Effects of Current and Magnetism

MEDIUM
JEE Main
IMPORTANT

A triangular shaped wire carrying 10 A current is placed in a uniform magnetic field of 0.5 T, as shown in figure. The magnetic force on segment CD is (Given BC=CD=BD=5 cm).

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MEDIUM
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IMPORTANT
The magnetic field at the center of current carrying circular loop is B1. The magnetic field at a distance of 3 times radius of the given circular loop from the center on its axis is B2. The value of B1B2 will be
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A closely wounded circular coil of radius 5 cm produces a magnetic field of 37.68×10-4 T at its center. The current through the coil is _____  A. [Given, number of turns in the coil is 100 and π=3.14]
EASY
JEE Main
IMPORTANT
A wire of length 314 cm carrying current of 14 A is bent to form a circle. The magnetic moment of the coil is A-m2. [Given π=3.14]
MEDIUM
JEE Main
IMPORTANT

A wire X of length 50 cm carrying a current of 2 A is placed parallel to a long wire Y of length 5 m. The wire Y carries a current of 3 A. The distance between two wires is 5 cm and currents flow in the same direction. The force acting on the wire Y is :

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EASY
JEE Main
IMPORTANT
The vertical component of the earth's magnetic field is 6×10-5 T at any place where the angle of dip is 37°. The earth's resultant magnetic field at that place will be (Given tan37°=34)
EASY
JEE Main
IMPORTANT
Two long straight wires P and Q carrying equal current 10 A each were kept parallel to each other at 5 cm distance. Magnitude of magnetic force experienced by 10 cm length of wire P is F1. If distance between wires is halved and currents on them are doubled, force F2 on 10 cm length of wire P will be:
MEDIUM
JEE Main
IMPORTANT
A circular loop of radius R is carrying current i A. The ratio of magnetic field at the centre of circular loop and at a distance R from the center of the loop on its axis is :