At what value should the variable resistor be set such that the bridge is balanced? If the source voltage is 30 V find the value of the output voltage across XY, when the bridge is balanced.

Two resistances 2 ohm and 3 ohm are connected across the two gaps of the metre bridge as shown in the figure .Calculate the current through the cell when the bridge is balanced and the specific resistance of the material of the metre bridge wire. Given the resistance of the bridge wire is 1.49 ohm and its diameter is 0.12 cm.

When the voltage applied across a bulb is 220 v the current passing through the bulb is 0.1 A . Find the power of the bulb.

When an a.c. current passes through a 14 Omega resistor, the power loss is 224 W. Find the r.m.s. values of current and voltage. Also find the maximum values of current and voltage. Find the steady value of current which when passed through this resistor will produce the same power loss as the a.c. current.

When a resistor of 5 Omega resistance is connected across a cell,its terminal potential difference is balanced by 150 cm of the wire and when a resistor of 10 Omega resistance is connected across cell, the terminal p.d. is balanced by 175 cm of same potentiometer wire. Find the balancing length when the cell is in open circuit and the internal resistance of acell.

A 2.0 V potentiometer is used to determine the internal resistance of 1.5 V cell. The balance point of the cell in the circuit is 75 cm . When a resistor of 10Omega is connected across cel, the balance point sifts to 60 cm . The internal resistance of the cell is

Figure shows a potentiometer circuit for comparison of two resistances.The balance point with a standard resistor R=10.0 Omega is found to be 58.3 cm,while that with the unknown resistance X is 68.5 cm. Determine the value of X. What might you do if you failed to find a balance point with the given cell of emf E ?

A peak value of alternating voltage is 494.97 V. Find reading on voltmeter used to measure it?

A coil having an inductance of 1/pi henry is connected in series with a resistance of 300Ω. if 20 volt from a 200 cycle source are impressed across the combination, the value of the phase angle between the voltage and the current is :

A Wheatstone's bridge shown in figure , is to be balanced . The value of chi must be , 4 Omega 8 Omega 16 Omega 32 Omega