Embibe Experts Solutions for Exercise 1: SAT 2020

The magnetic field at the centre of a circular coil of radius R carrying current I $B \alpha \frac{i}{R}$and its direction is given by the right-hand thumb rule. The magnetic field at the centre of a circular arc subtending and angle $\theta$ ( in degree) is $B\alpha \frac{i}{R}\left(\frac{\theta }{{360}^{°}}\right)$ and its direction can be found using the right-hand rule 

Consider two circular coils made of uniform conductors as shown in Figures 3 and 4. In figure 3 points C and D are diametrically opposite to each other, and in figure 4 $\angle P{O}_{2}Q=120°$. Then the magnetic fields _____.

A positively charged plate and negatively charged plate are kept parallel to each other at a distance of 10 cm. An electron is release near the negative plate. Looking from the negative plate towards the positive plate, the magnetic field produced by the moving electron will be