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qUESTIONS

In a balanced Wheatstone’s network, the resistances in the arms Q and S are interchanged. As a result of this

In the Wheatstone’s bridge (shown in figure) X=Y and A> B. The direction of the current between ab will be

In the circuit shown, a meter bridge is in its balanced state. The meter bridge wire has a resistance 0.1 ohm/cm. The value of unknown resistance X and the current drawn from the battery of negligible resistance is

The resistance in left and right gap of a meter bridge are 20Ω and 30Ω, respectively. When the resistance in the left gap is reduced to half its value, then balance point shifts by

MCQs-PYQs-12th-jee

A current loop consists of two identical semicircular parts each of radius R, one lying in the .x-y plane and the other in x-z plane. If the current in the loop is i. The resultant magnetic field due to the two semicircular parts at their common centre is

MCQs-PYQs-12th-jee

Two similar coils of radius R are lying concentrically with their planes at right angles to each other. the currents flowing in them are l and 2l, respectively. The resultant magnetic field in induction at the centre will be

MCQs-PYQs-12th-jee

A wire carrying current `I` has the shape as shown in the adjoining figure. Linear parts of the wire are very long and parallel to X-axis while semicicular portion of radius `R` is lying in `Y-Z` plane. Magnetic field at point `O` is

In meter bridge or Wheatstone bridge for measurement of resistance, the known and the unknown resistances are interchanged. The error so removed is

MCQs-PYQs-12th-jee

In a metre bridge experiment, resistances are connected as shown in figure. The balancing length l1 is 55 cm. Now an unknown resistance x is connected in series with P and the new balancing length is found to be 75 cm. The value of x is

Two resistances are connected in two gaps of a metre bridge. The balance point is 20 cm from the zero end. A resistance of 15 ohms is connected in series with the smaller of the two. The null point shifts to 40 cm. The value of the smaller resistance in ohms is

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