A poetential difference of 200 V is applied to a coil at a temperature of `15^(@)C` and the current is 10 A. What will be the mean temperature of the coil when the current hass fallen to 5 A, the applied voltage being same as before ? Given `alpha=(1)/(234).^(@)C^(-1) " at " 0^(@)C`.

A potential difference of 120 V is applied to a coil at temperature of 12^@C and the current is 6A. What will be the mean temperature of the coil when the curreny has fallen to 3 A, the applied voltage being the same as before ? Given temperature coefficient of resistance coil is .00427^@C^(-1) at 0^@C .

When an alternating voltage of 100V, 50 Hz is applied to a choke coil, it takes a current of 10 A and the power is 500 W. What is the choke coil?

200 V AC is applied to primary coil of a transformer and it is found that output current is 8 A and output voltage is 50 V. Assume no energy loss. Find the current in primary coil I ampere.

The heat generated is 5.4xx10^(4)J when a potential fifference of 50 volts is applied to a coil. Find the current in the coil when passed for 3 minutes to generate this heat.

A heating coil is connected in series with a resistance r. the coil is dipped in a liquid of mass 2kg and specific heat 0.5cal g^(-1) .^(@)C^(-1) . A potential difference of 200V is applied and the temperature of the liquid is found to increase by 60^(@)C in 20 minutes. if R is removed, the same rise in temperature is reached in 15minutes if R is removed, the same rise in temperature is reached in 15 minutes. find the value of R.

A heating coil is connected in series with a resistance r. the coil is dipped in a liquid of mass 2kg and specific heat 0.5cal g^(-1) .^(@)C^(-1) . A potential difference of 200V is applied and the temperature of the liquid is found to increase by 60^(@)C in 20 minutes. if R is removed, the same rise in temperature is reached in 15minutes if R is removed, the same rise in temperature is reached in 15 minutes. find the value of R.

The current through a conductor is 1 ampere when the temperature is 0^(@)C and 0.7 ampere when the temperature is 100^(@)C . What would be current when the temperature of the conductor is 1200^(@)C ?

When an AC signal of frequency 1 kHz is applied across a coil of resistance 100 Omega , then the applied voltage leads the current by 45^@ . The inductance of the coil is

When 10V,DC is applied across a coil current through it is 2.5A, if 10V,50Hz A.C. is supplied current reduces to 2A. Calculate reactance of the cell.

A 5^(@)C rise in the temperature is observed in a conductor by passing some current. When the current is doubled, then rise in temperature will be equal to