A proton is moving along negative $X$ axis. If a uniform magnetic field is applied parallel to the positive $Z$ axis, then choose the correct answer from the following options;
The proton will experience magnetic force along positive Y direction and will move along a circular path in the XY plane
The proton will experience magnetic force along negative Y direction and will move along a circular path in the XY plane
The proton will experience magnetic force along positive Y direction and will move along a circular path in the XZ plane
The proton will experience magnetic force along negative Y direction and will move along a circular path in the XZ plane
4
2
1
3
The magnetic field at the centre of a wire loop formed by two semicircular wires of radii $r_1=3.14 \mathrm{~m}$ and $r_2=6.28 \mathrm{~m}$ and carrying a current of $\mathrm{I}=2 \mathrm{~A}$ is:
$6 \times 10^{-7} T$
$2 \times 10^{-7} T$
$3 \times 10^{-7} T$
$4 \times 10^{-7} T$
Two vessels A and B contain same mass of Oxygen and Hydrogen respectively at the same temperature. The volume of $B$ is twice that of $A$. The ratio of gas pressure in $A$ to that in $B$ is
1: 8
1:64
1:256
1:32
Two conducting spherical shells $A$ and $B$ of radii 4 cm and 6 cm respectively are placed with their centres 17 cm apart in air. Initially, sphere A was given a -20 nC charge while sphere B was uncharged. The spheres are then connected by a long thin conducting wire and allowed to reach electrostatic equilibrium. Assuming no charge is lost to the surroundings, the final charge on sphere A and the ratio of magnitude of electric field intensity at the surface of sphere $B$ to that of sphere $A$ is given by;
$-12 \mathrm{nC} ; \frac{2}{3}$
$-8 \mathrm{nC} ; \frac{3}{2}$
$-12 \mathrm{nC} ; \frac{3}{2}$
$-8 \mathrm{nC} ; \frac{2}{3}$
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