In which element shielding effect is not possible?

The parametric equations of the circle&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><msup><mfenced><mrow><mi>x</mi><mo>-</mo><mn>3</mn></mrow></mfenced><mn>2</mn></msup><mo>+</mo><msup><mfenced><mrow><mi>y</mi><mo>-</mo><mn>2</mn></mrow></mfenced><mn>2</mn></msup><mo>=</mo><mn>100</mn></math>&nbsp;are&nbsp;

The coordinates of the point on the circle&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><msup><mrow><mo>(</mo><mi>x</mi><mo>−</mo><mn>1</mn><mo>)</mo></mrow><mn>2</mn></msup><mo>+</mo><msup><mrow><mo>(</mo><msup><mi>y</mi><mn>2</mn></msup><mo>+</mo><mn>2</mn><mo>)</mo></mrow><mn>2</mn></msup><mo>=</mo><mn>9</mn></math>&nbsp;having&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>θ</mi></math>&nbsp;as the parameter are

The parametric equations of the circle&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><msup><mi>x</mi><mn>2</mn></msup><mo>+</mo><msup><mi>y</mi><mn>2</mn></msup><mo>+</mo><mn>2</mn><mi>x</mi><mo>+</mo><mn>4</mn><mi>y</mi><mo>−</mo><mn>11</mn><mo>=</mo><mn>0</mn></math>&nbsp;are

Let P and Q are the two distinct points on a circle which has centre at C(4, 3) and which pass through origin. If OC is perpendicular to both the line segment CP and CQ, then the set (P, Q) is:

In which element shielding effect is not possible?

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