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A Choke coil is needed to operate an arc lamp at 160V (rms) and 50Hz. The lamp has an effective resistnce of 5Ω when running at 10A(rms). Calculate the inductance of the choke coil. If the same arc lamp is to be operated on 160V(DC), what additional resistance is required ? Compare the power loses in both cases.
08
Sep
A Choke coil is needed to operate an arc lamp at 160V (rms) and 50Hz. The lamp has an effective resistnce of 5Ω when running at 10A(rms). Calculate the inductance of the choke coil. If the same arc lamp is to be operated on 160V(DC), what additional resistance is required ? Compare the power loses [...]
A bulb is rated at 100 V, 100 W. It can be treated as a resistor. Find out the inductance of an inductor (called choke coil) that should be connected in series with the bulb at its rated power with the help of an ac source of 200 V and 50 Hz.
08
Sep
A bulb is rated at 100 V, 100 W. It can be treated as a resistor. Find out the inductance of an inductor (called choke coil) that should be connected in series with the bulb at its rated power with the help of an ac source of 200 V and 50 Hz. A bulb is [...]
A car A moves along north with velocity 30 km/h and another car B moves along east with velocity 40 km/h. The relative velocity of A with respect to B is
08
Sep
A car A moves along north with velocity 30 km/h and another car B moves along east with velocity 40 km/h. The relative velocity of A with respect to B is A car A moves along north with velocity 30 km/h and another car B moves along east with velocity 40 km/h. The relative velocity [...]
Two car A and B travelling in the same direction with velocities v1 and v2(v1 v2). When the car A is at a distance d behind of the car B , the driver of the car A applied the brake producing a uniform retardation a. There will be no collision when.
08
Sep
Two car A and B travelling in the same direction with velocities v1 and v2(v1 v2). When the car A is at a distance d behind of the car B , the driver of the car A applied the brake producing a uniform retardation a. There will be no collision when. the driver of the [...]
When an inductor coil is connected to an ideal battery of emf 10 V, a constant current 2.5 A flows. When the same inductor coil is connected to an ac source of 10 V and 50 Hz then the current is 2 A. Find out the indutance of the coil.
08
Sep
When an inductor coil is connected to an ideal battery of emf 10 V, a constant current 2.5 A flows. When the same inductor coil is connected to an ac source of 10 V and 50 Hz then the current is 2 A. Find out the indutance of the coil. a constant current 2.5 A [...]
A 9/100 pie inductor and a 12 ohm resistance are connected in series to a 225 V, Hz ac source. Calculate the current in the circuit and the phase angle between the current and the source voltage.
08
Sep
A 9/100 pie inductor and a 12 ohm resistance are connected in series to a 225 V, Hz ac source. Calculate the current in the circuit and the phase angle between the current and the source voltage. A 9/100 pie inductor and a 12 ohm resistance are connected in series to a 225 V Hz [...]
An express train is moving with a velocity V1. Its driver finds another train is moving on the same track in the same direction with velocity v2 s. To escape collision. driver applies retardation a on the train. The minimum time of escaping collision will be
08
Sep
An express train is moving with a velocity V1. Its driver finds another train is moving on the same track in the same direction with velocity v2 s. To escape collision. driver applies retardation a on the train. The minimum time of escaping collision will be The equation of trajectory of an oblique projectile y [...]
Show graphically that the average of sinusoidally varying current in half cycle may not be zero.
08
Sep
Show graphically that the average of sinusoidally varying current in half cycle may not be zero. Show graphically that the average of sinusoidally varying current in half cycle may not be zero. September 8, 2020 Category: Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) ,
An a.c. source of angular frequency ω is fed across a resistor R and a capacitor C in series. The current registered is I. If you the frequency of source is changed to ω/3, maintaining the same voltage, current in the circuits is found to be halved. Caculate the ratio of reactance to resistance at the original frequency ω.
08
Sep
An a.c. source of angular frequency ω is fed across a resistor R and a capacitor C in series. The current registered is I. If you the frequency of source is changed to ω/3, maintaining the same voltage, current in the circuits is found to be halved. Caculate the ratio of reactance to resistance at [...]
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An a.c. source of angular frequency ω is fed across a resistor R and a capacitor C in series. The current registered is I. If you the frequency of source is changed to ω/3 ,
current in the circuits is found to be halved. Caculate the ratio of reactance to resistance at the original frequency ω. ,
maintaining the same voltage ,
Two trains are moving with equal speed in opposite directions along two parallel railway tracks. If the wind is blowing with speed u along the track so that the relative velocities of the trains with respect to the wind are in the ratio 1 : 2, then the speed of each train must be
08
Sep
Two trains are moving with equal speed in opposite directions along two parallel railway tracks. If the wind is blowing with speed u along the track so that the relative velocities of the trains with respect to the wind are in the ratio 1 : 2, then the speed of each train must be The [...]