A thin disc of radius b=2a has concentric hole of radius ‘a’ in it (see figure). It carries uniform surface charge ‘σ’ on it. If the electric field on its axis at height ‘h’ (h<<a) from its centre is given as ‘Ch’, then value of ‘C’ is:

A thin disc of radius b=2a has concentric hole of radius ‘a’ in it

1.	A thin disc of radius b=2a has concentric hole of radius ‘a’ in it (see figure). It carries uniform surface charge ‘σ’ on it. If the electric field on its axis at height ‘h’ (h<<a) from its centre is given as ‘Ch’, then value of ‘C’ is:
Answer» A thin disc of radius $b = 2 a$ has concentric hole of radius ‘ $a$ ’ in it (see figure). It carries uniform surface charge ‘ $σ$ ’ on it. If the electric field on its axis at height ‘ $h$ ’ $(h << a)$ from its centre is given as ‘ $C h$ ’, then value of ‘ $C$ ’ is:

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A thin disc of radius b=2a has concentric hole of radius ‘a’ in it (see figure). It carries uniform surface charge ‘σ’ on it. If the electric field on its axis at height ‘h’ (h&lt;&lt;a) from its centre is given as ‘Ch’, then value of ‘C’ is:

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A thin disc of radius b=2a has concentric hole of radius ‘a’ in it (see figure). It carries uniform surface charge ‘σ’ on it. If the electric field on its axis at height ‘h’ (h<<a) from its centre is given as ‘Ch’, then value of ‘C’ is: