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Chapter 13: Problem 70
The net charge on a condenser is (A) Infinity (B) \(q / 2\) (C) \(2 q\) (D) Zero
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A half ring of radius \(R\) has a charge of \(\lambda\) per unit length. The potential at the centre of the half ring is (A) \(k \frac{\lambda}{R}\) (B) \(k \frac{\lambda}{\pi R}\) (C) \(k \frac{\pi \lambda}{R}\) (D) \(k \pi \lambda\)
A non-conducting solid sphere of radius \(R\) is uniformly charged. The
magnitude of the electric field due to the sphere at a distance \(r\) form its
centre
(A) increases as \(r\) increases for \(r
Choose the correct statements from the following: (A) If the electric field is zero at a point, the electric potential must also be zero at that point. (B) If electric potential is constant in a given region of space, the electric field must be zero in that region. (C) Two different equipotential surfaces can never intersect. (D) Electrons move from a region of lower potential to a region of higher potential.
A non-conducting ring of radius \(R\) has charge \(Q\) distributed uniformly over it. If it rotates with an angular velocity \(\omega\), the equivalent current will be (A) Zero (B) \(Q \omega\) (C) \(Q \frac{\omega}{2 \pi}\) (D) \(Q \frac{\omega}{2 \pi R}\)
Two identical charged spheres are suspended by strings of equal lengths. The strings make an angle of \(30^{\circ}\) with each other. When suspended in a liquid of density \(8 \mathrm{~g} \mathrm{~cm}^{-3}\), the angle remains the same. If density of the material of the sphere is \(16 \mathrm{~g} \mathrm{~cm}^{-3}\), the dielectric constant of the liquid is (A) 4 (B) 3 (C) 2 (D) 1
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