If null point of meter bridge is obtained at 50 cm what will be value of unknown resistor ?

200 Omega resistor is connected in one of the gaps of the meter bridge. Series combination of X Omega and 50 Omega resistors is connected in the second gap. Here unknown resistance X Omega is kept in a heat bath at a certain temperature. The unknown resistance and its temperature is....... and....... respectively if the balance point is obtained at 50 cm. The total length of the wire of the meter bridge is equal to 1 meter. The resistance of the unknown resistance at 0" "^(@)C temperature is equal to 100 Omega . alpha = 0.5 xx 10^(-3) ""^(@) C^(-1) for the material of the X Omega resistors.

A convex mirror and convex lens of radius of curvature 20 cm are placed on same axis with 30 cm separation. A point-like object is placed at 20 cm from convex lens and its image by this combination is obtained at object. What will be focal length of convex lens ?

On interchanging the resistance the balance point of a meter bridge shifts to the left by 10 cm. The resistance of their seris combination is 1 k Omega . How much was the resistance on the left slot before the interchange ?

For the network of resistance shown in the figure the equivalent resistance of the network between the points A and B is 18 ohm. The value of unknown resistance R is :

If not current flows through the galvanometer the find the value of unknown resistance X. Assume that resistance per unit length of wire AB is 0.02 Omega//cm . then also calculate total current given by battery.

In the circuit shown here, what is the value of the unknown resistor R so that the total resistance of the circuit between points P and Q is also equal to R

An alternating voltage V = 400 sin (500 omega t)V is connected to a 0.2 kOmega resistor, what will be the rms value of current ?

The near point of a hypermetropic eye is 75 cm. What is the focal length of the lens required to see clearly an object placed at 25 cm from the eye (normal near point)?

In the shown arrangement of the experiment of the meter bridge if AC corresponding to null deflection of galvanometer is x, what would be its value if the radius of the wire AB is doubled?