Four particles each having charge q are placed at the vertices of a square of side a. The value of the electric potential at the midpoint of one of the side will be
1. 0
2.
3.
4.
A metallic sphere of capacitance , charged to electric potential is connected by a metal wire to another metallic sphere of capacitance charged to electric potential . The amount of heat produced in connecting the wire during the process is:
1.
2.
3.
4. zero
The electric potential at the surface of a charged solid sphere of insulator is 20V. The value of electric potential at its centre will be
1. 30V
2. 20V
3. 40V
4. Zero
The capacitance of a parallel plate capacitor is C. If a dielectric slab of thickness equal to one-fourth of the plate separation and dielectric constant K is inserted between the plates, then new capacitance become
1.
2.
3.
4.
The electric potential at a point at distance 'r' from a short dipole is proportional to
(1)
(2)
(3)
(4)
You are traveling in a car during a thunderstorm. In order to protect yourself from lightning, you would prefer to
(1) Touch the nearest electric pole
(2) Take shelter under a tree
(3) Get out and crouch on the ground
(4) Remain in the car
Capacitors are connected in series across a source of emf 20KV. The potential difference across will be
(1) 5 KV
(2) 15 KV
(3) 10 KV
(4) 20 KV
Two metallic spheres of radii 2cm and 3cm are given charges 6mC and 4mC respectively. The final charge on the smaller sphere will be if they are connected by a conducting wire
(1) 4mC
(2) 6mC
(3) 5mC
(4) 10mC
1. | \(v\) | 2. | \(v \over \sqrt{2}\) |
3. | \(v \sqrt{2}\) | 4. | \(2v\) |