Physics Test 19...

Shown in the figure is a meter-bridge set up with null deflection in the galvanometer. The value of the unknown resistor R is

Constant current is flowing through a linear conductor of non-uniform area of cross-section. The charge flowing per second through the area of conductor at any cross-section is

A meter bridge is used to determine the resistance of an unknown wire by measuring the balance point length l. If the wire is replaced by another wire of same material but with double the length and half the thickness, the balancing point is expected to be

Potential difference between points A and B (i.e. V_A - V_B) is

When the switches are arranged so that the current through the battery is maximum, what is the voltage across points A and B-

The dimensions [MLT⁻²A⁻²] belong to the

A uniform conducting wire of length 12a and resistance 'R' is wound up as a current carrying coil in the shape of,

(i) an equilateral triangle of side 'a'.

(ii) a square of side 'a'.

The magnetic dipole moments of the coil in each case respectively are

The magnetic field B on the axis of a circular coil at distance x far away from its centre are related as:

The magnetic susceptibility is negative for

A rectangular coil of length 0.12 m and width 0.1 m having 50 turns of wire is suspended vertically in a uniform magnetic field of strength 0.2Weber/m². The coil carries a current of 2 A. If the plane of the coil is inclined at an angle of 30° with the direction of the field, the torque required to keep the coil in stable equilibrium will be