Electric Charges and Fields — Physics STD 12 Science — Question

A moving charge produces :

Which is a wrong statement (a) The Wheatstone bridge is most sensitive when all the four resistances are of the same order(b) In a balanced Wheatstone bridge, interchanging the positions of galvanometer and cell affects the balance of the bridge(c) Kirchhoff's first law (for currents meeting at a junction in an electric circuit) expresses the conservation of charge(d) The rheostat can be used as a potential divider

On charging by conduction, mass of a body may:

In a circuit with a coil of resistance 2 ohms, the magnetic flux changes from 2.0 Wb to 10.0 Wb in 0.2 second. The charge that flows in the coil during this time is(a) 5.0 coulomb(b) 4.0 coulomb(c) 1.0 coulomb(d) 0.8 coulomb

A step-up transformer operates on a 230 V line and supplies a load of 2 ampere. The ratio of the primary and secondary windings is 1 : 25. The current in the primary is(a) 15 A(b) 50 A(c) 25 A(d) 12.5 A

A convex lens forms a real image of a point object placed on its principal axis. If the upper half of the lens is painted black:

Hydrogen has________ isotopes.