Question

A ring of charge with radius of 0.5 m has 0.02 m gap. If the ring carries a charge of +1C, the field at the centre is:

• A. $2.31\times {10}^{4}N/C$
• B. $2.31\times {10}^{8}N/C$
• C. $1.6\times {10}^{4}N/C$
• D. $1.6\times {10}^{8}N/C$

Answer 1

The correct option is B $2.31\times {10}^{8}N/C$

A ring of charge $=0.5m$ has $0.02m$

$q=+1e$

The electric field at the centre $=$

Let us suppose the ring is complete, then, the complete ring has a large. $1c$ along with a negative charge of

So, $\frac{K_q}{r^2}=\frac{q\times {10}^9\times 1}{0.25}=2.31\times {10}^{8}N/C$