Physics · 2021
JEE Main · 17 March 2021, Shift 2 · Q12
A hairpin like shape as shown in figure is made by bending a long current carrying wire. What is the magnitude of a magnetic field at point P which…
A hairpin like shape as shown in figure is made by bending a long current carrying wire. What is the magnitude of a magnetic field at point P which lies on the centre of the semicircle?
Official answer
(3)
$\displaystyle \frac{\mu_0 \mathrm{I}}{4 \pi \mathrm{r}}(2+\pi)$
More from Magnetic Field and Forces
- A student is provided with a variable voltage source V, a test resistor R_T=10 Ω, two identical galvanometers G_1 and G_2 and two additional…2023
- An electron is projected with uniform velocity along the axis inside a current carrying long solenoid. Then:2024
- Given below are two statements: Statement I: If the number of turns in the coil of a moving coil galvanometer is doubled then the current sensitivity…2023
- For a moving coil galvanometer, the deflection in the coil is 0.05 rad when a current of 10 mA is passed through it. If the torsional constant of…2023
- An electron moves through a uniform magnetic field B=B_0 i+2 B_0 j T. At a particular instant of time, the velocity of electron is u=3 i+5 j m / s.…2024
- A uniform magnetic field of 2 × 10^-3 T acts along positive Y -direction. A rectangular loop of sides 20 cm and 10 cm with current of 5 A is in Y-Z…2024
- An infinitely long straight wire carrying current I is bent in a planer shape as shown in the diagram. The radius of the circular part is r. The…2026
- A wire of length 8 m is bent to form a circular loop in y-z plane. A current of 0.5 A is flowing in anticlockwise direction in it, the magnetic…2022
JEE Main 2021 Physics question, with the answer from NTA’s final answer key. Where our answers come from.