The electrostatic field due to a charged conductor just outside the conductor is
zero and parallel to the surface at every point inside the conductor
zero and is normal to the surface at every point inside the conductor
parallel to the surface at every point and zero inside the conductor
normal to the surface at every point and zero inside the conductor
D.
normal to the surface at every point and zero inside the conductor
The electrostatic field due to a charged conductor just outside the conductor is normal to the surface at every point and zero inside the conductor.
A point charge + q is placed at the midpoint of a cube of side a. The electric flux emerging from the cube is
zero
Figure below shows four plates each of area A and separated from one another by a distance d
What is the capacitance between P and Q ?
A soap bubble is charged to a potential of 16 V. Its radius is, then doubled. The potential of the bubble now will be
16 V
8 V
4 V
2 V
Resistors P and Q are connected in the gaps of the meter bridge. The balancing point is obtained m from the zero end. If a 6 Ω resistance is connected in series with P the balance point shifts to m from the same end. P and Q are
4, 2
2, 4
both (a) and (b)
neither (a) nor (b)
The currents i1 and i2 through the resistors R1 = 10 Ω and R2 = 30 Ω in the circuit diagram with E1 = 3 V , E2 = 3 V and E3 = 2 V are respectively
0.2 A, 0.1 A
0.4 A, 0.2 A
0.1 A, 0.2 A
0.2 A, 0.4 A
An -particle with a specific charge of 2.5 × 107 C-kg-1 moves with a speed of 2 × 105 ms-1 in a perpendicular magnetic field of 0.05 T. Then the radius of the circular path described by it is
8 cm
4 cm
16 cm
2 cm
A milliammeter of range O - 30 mA has internal resistance of 20Ω.The resistance to be connected in series to convert it into a voltmeter of maximum reading 3V is
49 Ω
80 Ω
40 Ω
30 Ω
A straight conductor of length I carrying a current I, is bent in the form of a semicircle. The magnetic field (in tesla) at the centre of the semicircle is
A coil having an inductance of 0.5 H carries a current which is uniformly varying from 0 to 10 A in 2s. The emf (in volts) generated in the coil is
10
5
2.5
1.25